251996928 has 36 divisors (see below), whose sum is σ = 670681368. Its totient is φ = 83998720.

The previous prime is 251996909. The next prime is 251996951. The reversal of 251996928 is 829699152.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 163293 + ... + 164828.

It is an arithmetic number, because the mean of its divisors is an integer number (18630038).

Almost surely, 2^251996928 is an apocalyptic number.

It is an amenable number.

251996928 is an abundant number, since it is smaller than the sum of its proper divisors (418684440).

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

251996928 is an equidigital number, since it uses as much as digits as its factorization.

251996928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 328140 (or 328126 counting only the distinct ones).

The product of its digits is 699840, while the sum is 51.

The square root of 251996928 is about 15874.4111071876. The cubic root of 251996928 is about 631.6333931075.

The spelling of 251996928 in words is "two hundred fifty-one million, nine hundred ninety-six thousand, nine hundred twenty-eight".