251572420 has 48 divisors (see below), whose sum is σ = 577459008. Its totient is φ = 91301760.

The previous prime is 251572393. The next prime is 251572421. The reversal of 251572420 is 24275152.

It is not an unprimeable number, because it can be changed into a prime (251572421) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 172414 + ... + 173866.

It is an arithmetic number, because the mean of its divisors is an integer number (12030396).

Almost surely, 2^251572420 is an apocalyptic number.

251572420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

251572420 is an abundant number, since it is smaller than the sum of its proper divisors (325886588).

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

251572420 is a wasteful number, since it uses less digits than its factorization.

251572420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2260 (or 2258 counting only the distinct ones).

The product of its (nonzero) digits is 5600, while the sum is 28.

The square root of 251572420 is about 15861.0346446882. The cubic root of 251572420 is about 631.2785155893.

The spelling of 251572420 in words is "two hundred fifty-one million, five hundred seventy-two thousand, four hundred twenty".