31872673987 has 8 divisors (see below), whose sum is σ = 39737359872. Its totient is φ = 24835849800.

The previous prime is 31872673957. The next prime is 31872673993. The reversal of 31872673987 is 78937627813.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31872673987 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31872673927) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 206965339 + ... + 206965492.

It is an arithmetic number, because the mean of its divisors is an integer number (4967169984).

Almost surely, 2^31872673987 is an apocalyptic number.

31872673987 is a deficient number, since it is larger than the sum of its proper divisors (7864685885).

31872673987 is a wasteful number, since it uses less digits than its factorization.

31872673987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 413930849.

The product of its digits is 21337344, while the sum is 61.

The spelling of 31872673987 in words is "thirty-one billion, eight hundred seventy-two million, six hundred seventy-three thousand, nine hundred eighty-seven".