31066428728 has 16 divisors (see below), whose sum is σ = 61675998480. Its totient is φ = 14619495808.

The previous prime is 31066428709. The next prime is 31066428761. The reversal of 31066428728 is 82782466013.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 114214676 + ... + 114214947.

It is an arithmetic number, because the mean of its divisors is an integer number (3854749905).

Almost surely, 2^31066428728 is an apocalyptic number.

It is an amenable number.

31066428728 is a deficient number, since it is larger than the sum of its proper divisors (30609569752).

31066428728 is a wasteful number, since it uses less digits than its factorization.

31066428728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228429646 (or 228429642 counting only the distinct ones).

The product of its (nonzero) digits is 774144, while the sum is 47.

The spelling of 31066428728 in words is "thirty-one billion, sixty-six million, four hundred twenty-eight thousand, seven hundred twenty-eight".