531868686828 has 12 divisors (see below), whose sum is σ = 1241026935960. Its totient is φ = 177289562272.

The previous prime is 531868686743. The next prime is 531868686857. The reversal of 531868686828 is 828686868135.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×531868686828² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22161195273 + ... + 22161195296.

It is an arithmetic number, because the mean of its divisors is an integer number (103418911330).

Almost surely, 2^531868686828 is an apocalyptic number.

It is an amenable number.

531868686828 is an abundant number, since it is smaller than the sum of its proper divisors (709158249132).

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

531868686828 is a wasteful number, since it uses less digits than its factorization.

531868686828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44322390576 (or 44322390574 counting only the distinct ones).

The product of its digits is 212336640, while the sum is 69.

The spelling of 531868686828 in words is "five hundred thirty-one billion, eight hundred sixty-eight million, six hundred eighty-six thousand, eight hundred twenty-eight".