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16220428 = 2272389283
BaseRepresentation
bin111101111000…
…000100001100
31010112002020121
4331320010030
513123023203
61335354324
7254604610
oct75700414
933462217
1016220428
119179714
1255229a4
13348bcb3
142223340
1516560bd
hexf7810c

16220428 has 48 divisors (see below), whose sum is σ = 34352640. Its totient is φ = 6551424.

The previous prime is 16220423. The next prime is 16220429. The reversal of 16220428 is 82402261.

Adding to 16220428 its reverse (82402261), we get a palindrome (98622689).

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (16220423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 57175 + ... + 57457.

It is an arithmetic number, because the mean of its divisors is an integer number (715680).

Almost surely, 216220428 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 16220428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17176320).

16220428 is an abundant number, since it is smaller than the sum of its proper divisors (18132212).

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

16220428 is a wasteful number, since it uses less digits than its factorization.

16220428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 406 (or 404 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 25.

The square root of 16220428 is about 4027.4592487076. The cubic root of 16220428 is about 253.1361107352.

The spelling of 16220428 in words is "sixteen million, two hundred twenty thousand, four hundred twenty-eight".

Divisors: 1 2 4 7 14 23 28 46 89 92 161 178 283 322 356 566 623 644 1132 1246 1981 2047 2492 3962 4094 6509 7924 8188 13018 14329 25187 26036 28658 45563 50374 57316 91126 100748 176309 182252 352618 579301 705236 1158602 2317204 4055107 8110214 16220428