31920680678 has 4 divisors (see below), whose sum is σ = 47881021020. Its totient is φ = 15960340338.

The previous prime is 31920680669. The next prime is 31920680689. The reversal of 31920680678 is 87608602913.

It is a semiprime because it is the product of two primes.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7980170168 + ... + 7980170171.

It is an arithmetic number, because the mean of its divisors is an integer number (11970255255).

Almost surely, 2^31920680678 is an apocalyptic number.

31920680678 is a deficient number, since it is larger than the sum of its proper divisors (15960340342).

31920680678 is a wasteful number, since it uses less digits than its factorization.

31920680678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15960340341.

The product of its (nonzero) digits is 870912, while the sum is 50.

The spelling of 31920680678 in words is "thirty-one billion, nine hundred twenty million, six hundred eighty thousand, six hundred seventy-eight".