51645256 has 64 divisors (see below), whose sum is σ = 109509120. Its totient is φ = 22671360.

The previous prime is 51645247. The next prime is 51645263. The reversal of 51645256 is 65254615.

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 267496 + ... + 267688.

It is an arithmetic number, because the mean of its divisors is an integer number (1711080).

Almost surely, 2^51645256 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 51645256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (54754560).

51645256 is an abundant number, since it is smaller than the sum of its proper divisors (57863864).

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

51645256 is a wasteful number, since it uses less digits than its factorization.

51645256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 326 (or 322 counting only the distinct ones).

The product of its digits is 36000, while the sum is 34.

The square root of 51645256 is about 7186.4633861170. The cubic root of 51645256 is about 372.4004051862.

The spelling of 51645256 in words is "fifty-one million, six hundred forty-five thousand, two hundred fifty-six".