31977616 has 40 divisors (see below), whose sum is σ = 69781248. Its totient is φ = 14064000.

The previous prime is 31977601. The next prime is 31977623. The reversal of 31977616 is 61677913.

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 (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2526 + ... + 8386.

Almost surely, 2^31977616 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31977616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34890624).

31977616 is an abundant number, since it is smaller than the sum of its proper divisors (37803632).

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

31977616 is a wasteful number, since it uses less digits than its factorization.

31977616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5911 (or 5905 counting only the distinct ones).

The product of its digits is 47628, while the sum is 40.

The square root of 31977616 is about 5654.8754186100. The cubic root of 31977616 is about 317.4061673242.

The spelling of 31977616 in words is "thirty-one million, nine hundred seventy-seven thousand, six hundred sixteen".