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51555330 = 23252919753
BaseRepresentation
bin1100010010101…
…0110000000010
310121000021121200
43010222300002
5101144232310
65041002030
71164133041
oct304526002
9117007550
1051555330
1127113312
1215323316
13a8b1318
146bc0558
1547d59c0
hex312ac02

51555330 has 48 divisors (see below), whose sum is σ = 138673080. Its totient is φ = 13273344.

The previous prime is 51555307. The next prime is 51555347. The reversal of 51555330 is 3355515.

It can be written as a sum of positive squares in 4 ways, for example, as 36832761 + 14722569 = 6069^2 + 3837^2 .

It is a junction number, because it is equal to n+sod(n) for n = 51555294 and 51555303.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7267 + ... + 12486.

Almost surely, 251555330 is an apocalyptic number.

51555330 is an abundant number, since it is smaller than the sum of its proper divisors (87117750).

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

51555330 is a wasteful number, since it uses less digits than its factorization.

51555330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19795 (or 19792 counting only the distinct ones).

The product of its (nonzero) digits is 5625, while the sum is 27.

The square root of 51555330 is about 7180.2040360981. The cubic root of 51555330 is about 372.1841353404.

The spelling of 51555330 in words is "fifty-one million, five hundred fifty-five thousand, three hundred thirty".

Divisors: 1 2 3 5 6 9 10 15 18 29 30 45 58 87 90 145 174 261 290 435 522 870 1305 2610 19753 39506 59259 98765 118518 177777 197530 296295 355554 572837 592590 888885 1145674 1718511 1777770 2864185 3437022 5155533 5728370 8592555 10311066 17185110 25777665 51555330