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55649280 = 210353623
BaseRepresentation
bin1101010001001…
…0010000000000
310212201021110110
43110102100000
5103221234110
65304431320
71244003541
oct324222000
9125637413
1055649280
112945a145
1216778540
13b6b588b
1475684c8
154d43a20
hex3512400

55649280 has 88 divisors (see below), whose sum is σ = 178039872. Its totient is φ = 14835712.

The previous prime is 55649273. The next prime is 55649281. The reversal of 55649280 is 8294655.

It is not an unprimeable number, because it can be changed into a prime (55649281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13549 + ... + 17171.

Almost surely, 255649280 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55649280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (89019936).

55649280 is an abundant number, since it is smaller than the sum of its proper divisors (122390592).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

55649280 is a wasteful number, since it uses less digits than its factorization.

55649280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3651 (or 3633 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 39.

The square root of 55649280 is about 7459.8445024008. The cubic root of 55649280 is about 381.7858690445.

The spelling of 55649280 in words is "fifty-five million, six hundred forty-nine thousand, two hundred eighty".

Divisors: 1 2 3 4 5 6 8 10 12 15 16 20 24 30 32 40 48 60 64 80 96 120 128 160 192 240 256 320 384 480 512 640 768 960 1024 1280 1536 1920 2560 3072 3623 3840 5120 7246 7680 10869 14492 15360 18115 21738 28984 36230 43476 54345 57968 72460 86952 108690 115936 144920 173904 217380 231872 289840 347808 434760 463744 579680 695616 869520 927488 1159360 1391232 1739040 1854976 2318720 2782464 3478080 3709952 4637440 5564928 6956160 9274880 11129856 13912320 18549760 27824640 55649280