31866666428 has 12 divisors (see below), whose sum is σ = 58191304080. Its totient is φ = 15240579552.

The previous prime is 31866666397. The next prime is 31866666431. The reversal of 31866666428 is 82466666813.

It is a happy number.

It is a congruent number.

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, 173188313 + ... + 173188496.

It is an arithmetic number, because the mean of its divisors is an integer number (4849275340).

Almost surely, 2^31866666428 is an apocalyptic number.

It is an amenable number.

31866666428 is a deficient number, since it is larger than the sum of its proper divisors (26324637652).

31866666428 is a wasteful number, since it uses less digits than its factorization.

31866666428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 346376836 (or 346376834 counting only the distinct ones).

The product of its digits is 11943936, while the sum is 56.

The spelling of 31866666428 in words is "thirty-one billion, eight hundred sixty-six million, six hundred sixty-six thousand, four hundred twenty-eight".