256755690 has 32 divisors (see below), whose sum is σ = 684682560. Its totient is φ = 68468112.

The previous prime is 256755679. The next prime is 256755731. The reversal of 256755690 is 96557652.

256755690 is a `hidden beast` number, since 2 + 5 + 6 + 7 + 556 + 90 = 666.

256755690 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×256755690² = 131846968694752200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

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, 475204 + ... + 475743.

It is an arithmetic number, because the mean of its divisors is an integer number (21396330).

Almost surely, 2^256755690 is an apocalyptic number.

256755690 is an abundant number, since it is smaller than the sum of its proper divisors (427926870).

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

256755690 is a wasteful number, since it uses less digits than its factorization.

256755690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 950963 (or 950957 counting only the distinct ones).

The product of its (nonzero) digits is 567000, while the sum is 45.

The square root of 256755690 is about 16023.5979105818. The cubic root of 256755690 is about 635.5845898901.

The spelling of 256755690 in words is "two hundred fifty-six million, seven hundred fifty-five thousand, six hundred ninety".