251420320 has 24 divisors (see below), whose sum is σ = 593980884. Its totient is φ = 100568064.

The previous prime is 251420317. The next prime is 251420321. The reversal of 251420320 is 23024152.

It can be written as a sum of positive squares in 2 ways, for example, as 245486224 + 5934096 = 15668^2 + 2436^2 .

It is not an unprimeable number, because it can be changed into a prime (251420321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 785529 + ... + 785848.

Almost surely, 2^251420320 is an apocalyptic number.

251420320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

251420320 is an abundant number, since it is smaller than the sum of its proper divisors (342560564).

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

251420320 is a wasteful number, since it uses less digits than its factorization.

251420320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1571392 (or 1571384 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 251420320 is about 15856.2391505678. The cubic root of 251420320 is about 631.1512668506.

Adding to 251420320 its reverse (23024152), we get a palindrome (274444472).

The spelling of 251420320 in words is "two hundred fifty-one million, four hundred twenty thousand, three hundred twenty".