31878714507 has 4 divisors (see below), whose sum is σ = 42504952680. Its totient is φ = 21252476336.

The previous prime is 31878714473. The next prime is 31878714589. The reversal of 31878714507 is 70541787813.

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

It is a cyclic number.

It is not a de Polignac number, because 31878714507 - 2¹⁹ = 31878190219 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31878714507.

It is not an unprimeable number, because it can be changed into a prime (31878712507) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5313119082 + ... + 5313119087.

It is an arithmetic number, because the mean of its divisors is an integer number (10626238170).

Almost surely, 2^31878714507 is an apocalyptic number.

31878714507 is a deficient number, since it is larger than the sum of its proper divisors (10626238173).

31878714507 is a wasteful number, since it uses less digits than its factorization.

31878714507 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10626238172.

The product of its (nonzero) digits is 1317120, while the sum is 51.

The spelling of 31878714507 in words is "thirty-one billion, eight hundred seventy-eight million, seven hundred fourteen thousand, five hundred seven".