256620287200 has 72 divisors (see below), whose sum is σ = 635056260048. Its totient is φ = 101241953280.

The previous prime is 256620287191. The next prime is 256620287237. The reversal of 256620287200 is 2782026652.

It is a happy number.

It is a super-2 number, since 2×256620287200² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2138692 + ... + 2255491.

It is an arithmetic number, because the mean of its divisors is an integer number (8820225834).

Almost surely, 2^256620287200 is an apocalyptic number.

256620287200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

256620287200 is an abundant number, since it is smaller than the sum of its proper divisors (378435972848).

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

256620287200 is a wasteful number, since it uses less digits than its factorization.

256620287200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4394276 (or 4394263 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 40.

The spelling of 256620287200 in words is "two hundred fifty-six billion, six hundred twenty million, two hundred eighty-seven thousand, two hundred".