31422887772 has 12 divisors (see below), whose sum is σ = 73320071496. Its totient is φ = 10474295920.

The previous prime is 31422887729. The next prime is 31422887779. The reversal of 31422887772 is 27778822413.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31422887779) 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, 1309286979 + ... + 1309287002.

It is an arithmetic number, because the mean of its divisors is an integer number (6110005958).

Almost surely, 2^31422887772 is an apocalyptic number.

It is an amenable number.

31422887772 is an abundant number, since it is smaller than the sum of its proper divisors (41897183724).

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

31422887772 is a wasteful number, since it uses less digits than its factorization.

31422887772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2618573988 (or 2618573986 counting only the distinct ones).

The product of its digits is 2107392, while the sum is 51.

The spelling of 31422887772 in words is "thirty-one billion, four hundred twenty-two million, eight hundred eighty-seven thousand, seven hundred seventy-two".