256748784 has 20 divisors (see below), whose sum is σ = 663267816. Its totient is φ = 85582912.

The previous prime is 256748777. The next prime is 256748819. The reversal of 256748784 is 487847652.

It is a congruent number.

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, 2674419 + ... + 2674514.

Almost surely, 2^256748784 is an apocalyptic number.

256748784 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

256748784 is an abundant number, since it is smaller than the sum of its proper divisors (406519032).

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

256748784 is a wasteful number, since it uses less digits than its factorization.

256748784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5348944 (or 5348938 counting only the distinct ones).

The product of its digits is 3010560, while the sum is 51.

The square root of 256748784 is about 16023.3824144592. The cubic root of 256748784 is about 635.5788913646.

The spelling of 256748784 in words is "two hundred fifty-six million, seven hundred forty-eight thousand, seven hundred eighty-four".