517640420 has 36 divisors (see below), whose sum is σ = 1194856572. Its totient is φ = 188232000.

The previous prime is 517640419. The next prime is 517640447. The reversal of 517640420 is 24046715.

It can be written as a sum of positive squares in 2 ways, for example, as 282508864 + 235131556 = 16808^2 + 15334^2 .

It is a Smith number, since the sum of its digits (29) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 104531 + ... + 109370.

Almost surely, 2^517640420 is an apocalyptic number.

It is an amenable number.

517640420 is an abundant number, since it is smaller than the sum of its proper divisors (677216152).

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

517640420 is a wasteful number, since it uses less digits than its factorization.

517640420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213932 (or 213919 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 29.

The square root of 517640420 is about 22751.7124630213. The cubic root of 517640420 is about 802.9269965533.

The spelling of 517640420 in words is "five hundred seventeen million, six hundred forty thousand, four hundred twenty".