256785587652 has 24 divisors (see below), whose sum is σ = 653636041632. Its totient is φ = 77813814400.

The previous prime is 256785587623. The next prime is 256785587671.

256785587652 is nontrivially palindromic in base 10.

It is a super-4 number, since 4×256785587652⁴ (a number of 47 digits) contains 4444 as substring.

It is a Harshad number since it is a multiple of its sum of digits (66).

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, 972672549 + ... + 972672812.

It is an arithmetic number, because the mean of its divisors is an integer number (27234835068).

Almost surely, 2^256785587652 is an apocalyptic number.

256785587652 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

256785587652 is an abundant number, since it is smaller than the sum of its proper divisors (396850453980).

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

256785587652 is a wasteful number, since it uses less digits than its factorization.

256785587652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1945345379 (or 1945345377 counting only the distinct ones).

The product of its digits is 282240000, while the sum is 66.

The spelling of 256785587652 in words is "two hundred fifty-six billion, seven hundred eighty-five million, five hundred eighty-seven thousand, six hundred fifty-two".