256651464 has 16 divisors (see below), whose sum is σ = 641628720. Its totient is φ = 85550480.

The previous prime is 256651441. The next prime is 256651481. The reversal of 256651464 is 464156652.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5346882 + ... + 5346929.

It is an arithmetic number, because the mean of its divisors is an integer number (40101795).

Almost surely, 2^256651464 is an apocalyptic number.

256651464 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

256651464 is an abundant number, since it is smaller than the sum of its proper divisors (384977256).

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

256651464 is a wasteful number, since it uses less digits than its factorization.

256651464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10693820 (or 10693816 counting only the distinct ones).

The product of its digits is 172800, while the sum is 39.

The square root of 256651464 is about 16020.3453146304. The cubic root of 256651464 is about 635.4985763402.

The spelling of 256651464 in words is "two hundred fifty-six million, six hundred fifty-one thousand, four hundred sixty-four".