518232640 has 56 divisors (see below), whose sum is σ = 1243154232. Its totient is φ = 205762560.

The previous prime is 518232613. The next prime is 518232643. The reversal of 518232640 is 46232815.

It can be written as a sum of positive squares in 4 ways, for example, as 13601344 + 504631296 = 3688^2 + 22464^2 .

It is a super-2 number, since 2×518232640² = 537130138322739200, which contains 22 as substring.

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (518232643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37930 + ... + 49750.

Almost surely, 2^518232640 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 518232640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (621577116).

518232640 is an abundant number, since it is smaller than the sum of its proper divisors (724921592).

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

518232640 is a wasteful number, since it uses less digits than its factorization.

518232640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11975 (or 11965 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 31.

The square root of 518232640 is about 22764.7235871644. The cubic root of 518232640 is about 803.2330830328.

The spelling of 518232640 in words is "five hundred eighteen million, two hundred thirty-two thousand, six hundred forty".