521829864 has 56 divisors (see below), whose sum is σ = 1466991810. Its totient is φ = 173941344.

The previous prime is 521829853. The next prime is 521829887. The reversal of 521829864 is 468928125.

It can be written as a sum of positive squares in only one way, i.e., 521756964 + 72900 = 22842^2 + 270^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 38907 + ... + 50570.

Almost surely, 2^521829864 is an apocalyptic number.

521829864 is a gapful number since it is divisible by the number (54) formed by its first and last digit.

It is an amenable number.

521829864 is an abundant number, since it is smaller than the sum of its proper divisors (945161946).

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

521829864 is an equidigital number, since it uses as much as digits as its factorization.

521829864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89501 (or 89482 counting only the distinct ones).

The product of its digits is 276480, while the sum is 45.

The square root of 521829864 is about 22843.5956889453. The cubic root of 521829864 is about 805.0873014638.

The spelling of 521829864 in words is "five hundred twenty-one million, eight hundred twenty-nine thousand, eight hundred sixty-four".