256421452360 has 32 divisors (see below), whose sum is σ = 577313798400. Its totient is φ = 102503597760.

The previous prime is 256421452333. The next prime is 256421452429. The reversal of 256421452360 is 63254124652.

It is a happy number.

It is a super-2 number, since 2×256421452360² (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 an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1966776 + ... + 2093095.

It is an arithmetic number, because the mean of its divisors is an integer number (18041056200).

Almost surely, 2^256421452360 is an apocalyptic number.

256421452360 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

256421452360 is an abundant number, since it is smaller than the sum of its proper divisors (320892346040).

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

256421452360 is a wasteful number, since it uses less digits than its factorization.

256421452360 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4061461 (or 4061457 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 40.

The spelling of 256421452360 in words is "two hundred fifty-six billion, four hundred twenty-one million, four hundred fifty-two thousand, three hundred sixty".