521308812828 has 48 divisors (see below), whose sum is σ = 1304242490880. Its totient is φ = 161477631744.

The previous prime is 521308812823. The next prime is 521308812853. The reversal of 521308812828 is 828218803125.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521308812821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16157526 + ... + 16189757.

It is an arithmetic number, because the mean of its divisors is an integer number (27171718560).

Almost surely, 2^521308812828 is an apocalyptic number.

It is an amenable number.

521308812828 is an abundant number, since it is smaller than the sum of its proper divisors (782933678052).

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

521308812828 is a wasteful number, since it uses less digits than its factorization.

521308812828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32347386 (or 32347384 counting only the distinct ones).

The product of its (nonzero) digits is 491520, while the sum is 48.

The spelling of 521308812828 in words is "five hundred twenty-one billion, three hundred eight million, eight hundred twelve thousand, eight hundred twenty-eight".