256346506 has 16 divisors (see below), whose sum is σ = 414362088. Its totient is φ = 118238400.

The previous prime is 256346491. The next prime is 256346539. The reversal of 256346506 is 605643652.

256346506 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 249798025 + 6548481 = 15805^2 + 2559^2 .

It is a super-2 number, since 2×256346506² = 131427062276816072, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 77976 + ... + 81196.

Almost surely, 2^256346506 is an apocalyptic number.

256346506 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

256346506 is a deficient number, since it is larger than the sum of its proper divisors (158015582).

256346506 is a wasteful number, since it uses less digits than its factorization.

256346506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6297.

The product of its (nonzero) digits is 129600, while the sum is 37.

The square root of 256346506 is about 16010.8246508417. The cubic root of 256346506 is about 635.2467728741.

The spelling of 256346506 in words is "two hundred fifty-six million, three hundred forty-six thousand, five hundred six".