251063560 has 64 divisors (see below), whose sum is σ = 618554880. Its totient is φ = 90954240.

The previous prime is 251063509. The next prime is 251063573. The reversal of 251063560 is 65360152.

It is a super-2 number, since 2×251063560² = 126065822319747200, which contains 22 as substring.

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, 136809 + ... + 138631.

It is an arithmetic number, because the mean of its divisors is an integer number (9664920).

Almost surely, 2^251063560 is an apocalyptic number.

251063560 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 251063560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (309277440).

251063560 is an abundant number, since it is smaller than the sum of its proper divisors (367491320).

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

251063560 is a wasteful number, since it uses less digits than its factorization.

251063560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2158 (or 2154 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 28.

The square root of 251063560 is about 15844.9853265947. The cubic root of 251063560 is about 630.8525955346.

The spelling of 251063560 in words is "two hundred fifty-one million, sixty-three thousand, five hundred sixty".