251328560 has 40 divisors (see below), whose sum is σ = 667817376. Its totient is φ = 86169600.

The previous prime is 251328557. The next prime is 251328577. The reversal of 251328560 is 65823152.

It is a tau number, because it is divible by the number of its divisors (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, 223841 + ... + 224960.

Almost surely, 2^251328560 is an apocalyptic number.

251328560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

251328560 is an abundant number, since it is smaller than the sum of its proper divisors (416488816).

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

251328560 is a wasteful number, since it uses less digits than its factorization.

251328560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 448821 (or 448815 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 32.

The square root of 251328560 is about 15853.3453882769. The cubic root of 251328560 is about 631.0744744799.

The spelling of 251328560 in words is "two hundred fifty-one million, three hundred twenty-eight thousand, five hundred sixty".