256823093784 has 64 divisors (see below), whose sum is σ = 691567747200. Its totient is φ = 79215929856.

The previous prime is 256823093767. The next prime is 256823093801. The reversal of 256823093784 is 487390328652.

It is an interprime number because it is at equal distance from previous prime (256823093767) and next prime (256823093801).

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6529329 + ... + 6568544.

It is an arithmetic number, because the mean of its divisors is an integer number (10805746050).

Almost surely, 2^256823093784 is an apocalyptic number.

256823093784 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

256823093784 is an abundant number, since it is smaller than the sum of its proper divisors (434744653416).

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

256823093784 is a wasteful number, since it uses less digits than its factorization.

256823093784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13097944 (or 13097940 counting only the distinct ones).

The product of its (nonzero) digits is 17418240, while the sum is 57.

The spelling of 256823093784 in words is "two hundred fifty-six billion, eight hundred twenty-three million, ninety-three thousand, seven hundred eighty-four".