31972640073 has 64 divisors (see below), whose sum is σ = 47779200000. Its totient is φ = 18856431360.

The previous prime is 31972640071. The next prime is 31972640087. The reversal of 31972640073 is 37004627913.

It is not a de Polignac number, because 31972640073 - 2¹ = 31972640071 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31972640071) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 64073178 + ... + 64073676.

It is an arithmetic number, because the mean of its divisors is an integer number (746550000).

Almost surely, 2^31972640073 is an apocalyptic number.

31972640073 is a gapful number since it is divisible by the number (33) formed by its first and last digit.

It is an amenable number.

31972640073 is a deficient number, since it is larger than the sum of its proper divisors (15806559927).

31972640073 is a wasteful number, since it uses less digits than its factorization.

31972640073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 902.

The product of its (nonzero) digits is 190512, while the sum is 42.

The spelling of 31972640073 in words is "thirty-one billion, nine hundred seventy-two million, six hundred forty thousand, seventy-three".