256416690 has 16 divisors (see below), whose sum is σ = 615400128. Its totient is φ = 68377776.

The previous prime is 256416689. The next prime is 256416731. The reversal of 256416690 is 96614652.

It is a super-2 number, since 2×256416690² = 131499037821112200, 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, 4273582 + ... + 4273641.

It is an arithmetic number, because the mean of its divisors is an integer number (38462508).

Almost surely, 2^256416690 is an apocalyptic number.

256416690 is an abundant number, since it is smaller than the sum of its proper divisors (358983438).

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

256416690 is a wasteful number, since it uses less digits than its factorization.

256416690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8547233.

The product of its (nonzero) digits is 77760, while the sum is 39.

The square root of 256416690 is about 16013.0162680240. The cubic root of 256416690 is about 635.3047414053.

The spelling of 256416690 in words is "two hundred fifty-six million, four hundred sixteen thousand, six hundred ninety".