255308690 has 64 divisors (see below), whose sum is σ = 569528064. Its totient is φ = 80241408.

The previous prime is 255308639. The next prime is 255308701. The reversal of 255308690 is 96803552.

It is a super-2 number, since 2×255308690² = 130365054379032200, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 141977 + ... + 143763.

It is an arithmetic number, because the mean of its divisors is an integer number (8898876).

Almost surely, 2^255308690 is an apocalyptic number.

255308690 is an abundant number, since it is smaller than the sum of its proper divisors (314219374).

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

255308690 is a wasteful number, since it uses less digits than its factorization.

255308690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1971.

The product of its (nonzero) digits is 64800, while the sum is 38.

The square root of 255308690 is about 15978.3819581333. The cubic root of 255308690 is about 634.3883502088.

The spelling of 255308690 in words is "two hundred fifty-five million, three hundred eight thousand, six hundred ninety".