251916028 has 48 divisors (see below), whose sum is σ = 543954880. Its totient is φ = 99408384.

The previous prime is 251915999. The next prime is 251916037. The reversal of 251916028 is 820619152.

It is a junction number, because it is equal to n+sod(n) for n = 251915984 and 251916002.

It is a congruent number.

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, 222568 + ... + 223696.

Almost surely, 2^251916028 is an apocalyptic number.

251916028 is a gapful number since it is divisible by the number (28) 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 251916028, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (271977440).

251916028 is an abundant number, since it is smaller than the sum of its proper divisors (292038852).

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

251916028 is a wasteful number, since it uses less digits than its factorization.

251916028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1766 (or 1764 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 34.

The square root of 251916028 is about 15871.8627766246. The cubic root of 251916028 is about 631.5657935920.

The spelling of 251916028 in words is "two hundred fifty-one million, nine hundred sixteen thousand, twenty-eight".