31977428 has 24 divisors (see below), whose sum is σ = 64103424. Its totient is φ = 13672800.

The previous prime is 31977409. The next prime is 31977443. The reversal of 31977428 is 82477913.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14093 + ... + 16203.

It is an arithmetic number, because the mean of its divisors is an integer number (2670976).

Almost surely, 2^31977428 is an apocalyptic number.

It is an amenable number.

31977428 is an abundant number, since it is smaller than the sum of its proper divisors (32125996).

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

31977428 is a wasteful number, since it uses less digits than its factorization.

31977428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2663 (or 2661 counting only the distinct ones).

The product of its digits is 84672, while the sum is 41.

The square root of 31977428 is about 5654.8587957614. The cubic root of 31977428 is about 317.4055453008.

The spelling of 31977428 in words is "thirty-one million, nine hundred seventy-seven thousand, four hundred twenty-eight".