31880457616 has 30 divisors (see below), whose sum is σ = 71853022950. Its totient is φ = 13663052928.

The previous prime is 31880457607. The next prime is 31880457643. The reversal of 31880457616 is 61675408813.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 30919705600 + 960752016 = 175840^2 + 30996^2 .

It is a hoax number, since the sum of its digits (49) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a self number, because there is not a number n which added to its sum of digits gives 31880457616.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 20331141 + ... + 20332708.

It is an arithmetic number, because the mean of its divisors is an integer number (2395100765).

Almost surely, 2^31880457616 is an apocalyptic number.

It is an amenable number.

31880457616 is an abundant number, since it is smaller than the sum of its proper divisors (39972565334).

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

31880457616 is a wasteful number, since it uses less digits than its factorization.

31880457616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40663871 (or 40663858 counting only the distinct ones).

The product of its (nonzero) digits is 967680, while the sum is 49.

The spelling of 31880457616 in words is "thirty-one billion, eight hundred eighty million, four hundred fifty-seven thousand, six hundred sixteen".