251028396 has 30 divisors (see below), whose sum is σ = 656238660. Its totient is φ = 83676024.

The previous prime is 251028389. The next prime is 251028397. The reversal of 251028396 is 693820152.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 251028396.

It is not an unprimeable number, because it can be changed into a prime (251028397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 387066 + ... + 387713.

It is an arithmetic number, because the mean of its divisors is an integer number (21874622).

Almost surely, 2^251028396 is an apocalyptic number.

It is an amenable number.

251028396 is an abundant number, since it is smaller than the sum of its proper divisors (405210264).

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

251028396 is a wasteful number, since it uses less digits than its factorization.

251028396 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 774795 (or 774784 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The square root of 251028396 is about 15843.8756622236. The cubic root of 251028396 is about 630.8231417230.

The spelling of 251028396 in words is "two hundred fifty-one million, twenty-eight thousand, three hundred ninety-six".