31445442772 has 24 divisors (see below), whose sum is σ = 57456000000. Its totient is φ = 15030249696.

The previous prime is 31445442737. The next prime is 31445442797. The reversal of 31445442772 is 27724454413.

It is a super-2 number, since 2×31445442772² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57229 + ... + 257227.

It is an arithmetic number, because the mean of its divisors is an integer number (2394000000).

Almost surely, 2^31445442772 is an apocalyptic number.

It is an amenable number.

31445442772 is a deficient number, since it is larger than the sum of its proper divisors (26010557228).

31445442772 is a wasteful number, since it uses less digits than its factorization.

31445442772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201735 (or 201733 counting only the distinct ones).

The product of its digits is 752640, while the sum is 43.

The spelling of 31445442772 in words is "thirty-one billion, four hundred forty-five million, four hundred forty-two thousand, seven hundred seventy-two".