256274877480 has 256 divisors, whose sum is σ = 802243353600. Its totient is φ = 65432862720.

The previous prime is 256274877479. The next prime is 256274877497. The reversal of 256274877480 is 84778472652.

It is a happy number.

It is a super-2 number, since 2×256274877480² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 246654801 + ... + 246655839.

It is an arithmetic number, because the mean of its divisors is an integer number (3133763100).

Almost surely, 2^256274877480 is an apocalyptic number.

256274877480 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 256274877480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (401121676800).

256274877480 is an abundant number, since it is smaller than the sum of its proper divisors (545968476120).

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

256274877480 is a wasteful number, since it uses less digits than its factorization.

256274877480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1924 (or 1920 counting only the distinct ones).

The product of its (nonzero) digits is 42147840, while the sum is 60.

The spelling of 256274877480 in words is "two hundred fifty-six billion, two hundred seventy-four million, eight hundred seventy-seven thousand, four hundred eighty".