518631640 has 16 divisors (see below), whose sum is σ = 1166921280. Its totient is φ = 207452640.

The previous prime is 518631637. The next prime is 518631647. The reversal of 518631640 is 46136815.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 518631596 and 518631605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (518631647) 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, 6482856 + ... + 6482935.

It is an arithmetic number, because the mean of its divisors is an integer number (72932580).

Almost surely, 2^518631640 is an apocalyptic number.

It is an amenable number.

518631640 is an abundant number, since it is smaller than the sum of its proper divisors (648289640).

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

518631640 is a wasteful number, since it uses less digits than its factorization.

518631640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12965802 (or 12965798 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 34.

The square root of 518631640 is about 22773.4854600696. The cubic root of 518631640 is about 803.4391730907.

The spelling of 518631640 in words is "five hundred eighteen million, six hundred thirty-one thousand, six hundred forty".