251312028 has 48 divisors (see below), whose sum is σ = 661772160. Its totient is φ = 73528000.

The previous prime is 251312023. The next prime is 251312041. The reversal of 251312028 is 820213152.

It is a junction number, because it is equal to n+sod(n) for n = 251311989 and 251312007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251312023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28998 + ... + 36653.

It is an arithmetic number, because the mean of its divisors is an integer number (13786920).

Almost surely, 2^251312028 is an apocalyptic number.

It is an amenable number.

251312028 is an abundant number, since it is smaller than the sum of its proper divisors (410460132).

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

251312028 is a wasteful number, since it uses less digits than its factorization.

251312028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65698 (or 65696 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 251312028 is about 15852.8239755572. The cubic root of 251312028 is about 631.0606371455.

It can be divided in two parts, 2513 and 12028, that added together give a palindrome (14541).

The spelling of 251312028 in words is "two hundred fifty-one million, three hundred twelve thousand, twenty-eight".