251972280 has 96 divisors (see below), whose sum is σ = 935906400. Its totient is φ = 57593088.

The previous prime is 251972269. The next prime is 251972293. The reversal of 251972280 is 82279152.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 47475 + ... + 52514.

It is an arithmetic number, because the mean of its divisors is an integer number (9749025).

Almost surely, 2^251972280 is an apocalyptic number.

251972280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

251972280 is an abundant number, since it is smaller than the sum of its proper divisors (683934120).

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

251972280 is a wasteful number, since it uses less digits than its factorization.

251972280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100013 (or 100006 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The square root of 251972280 is about 15873.6347444434. The cubic root of 251972280 is about 631.6127989312.

It can be divided in two parts, 251972 and 280, that added together give a palindrome (252252).

The spelling of 251972280 in words is "two hundred fifty-one million, nine hundred seventy-two thousand, two hundred eighty".