646151256 has 40 divisors (see below), whose sum is σ = 1809823620. Its totient is φ = 215383536.

The previous prime is 646151243. The next prime is 646151263. The reversal of 646151256 is 652151646.

646151256 is a `hidden beast` number, since 646 + 1 + 5 + 1 + 2 + 5 + 6 = 666.

It is a super-2 number, since 2×646151256² = 835022891260755072, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 646151256.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 497926 + ... + 499221.

Almost surely, 2^646151256 is an apocalyptic number.

It is an amenable number.

646151256 is an abundant number, since it is smaller than the sum of its proper divisors (1163672364).

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

646151256 is a wasteful number, since it uses less digits than its factorization.

646151256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 997165 (or 997152 counting only the distinct ones).

The product of its digits is 43200, while the sum is 36.

The square root of 646151256 is about 25419.5054239849. The cubic root of 646151256 is about 864.5260107136.

The spelling of 646151256 in words is "six hundred forty-six million, one hundred fifty-one thousand, two hundred fifty-six".