251012028 has 24 divisors (see below), whose sum is σ = 596747088. Its totient is φ = 82091776.

The previous prime is 251011997. The next prime is 251012029. The reversal of 251012028 is 820210152.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 251011995 and 251012013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251012029) 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 7 ways as a sum of consecutive naturals, for example, 196701 + ... + 197972.

It is an arithmetic number, because the mean of its divisors is an integer number (24864462).

Almost surely, 2^251012028 is an apocalyptic number.

It is an amenable number.

251012028 is an abundant number, since it is smaller than the sum of its proper divisors (345735060).

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

251012028 is a wasteful number, since it uses less digits than its factorization.

251012028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 394733 (or 394731 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 21.

The square root of 251012028 is about 15843.3591135213. The cubic root of 251012028 is about 630.8094307408.

The spelling of 251012028 in words is "two hundred fifty-one million, twelve thousand, twenty-eight".