515257864 has 16 divisors (see below), whose sum is σ = 1053936720. Its totient is φ = 234208080.

The previous prime is 515257859. The next prime is 515257867. The reversal of 515257864 is 468752515.

It is a self number, because there is not a number n which added to its sum of digits gives 515257864.

It is not an unprimeable number, because it can be changed into a prime (515257867) 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, 2927514 + ... + 2927689.

It is an arithmetic number, because the mean of its divisors is an integer number (65871045).

Almost surely, 2^515257864 is an apocalyptic number.

It is an amenable number.

515257864 is an abundant number, since it is smaller than the sum of its proper divisors (538678856).

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

515257864 is a wasteful number, since it uses less digits than its factorization.

515257864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5855220 (or 5855216 counting only the distinct ones).

The product of its digits is 336000, while the sum is 43.

The square root of 515257864 is about 22699.2921475539. The cubic root of 515257864 is about 801.6932179047.

The spelling of 515257864 in words is "five hundred fifteen million, two hundred fifty-seven thousand, eight hundred sixty-four".