31377358644 has 12 divisors (see below), whose sum is σ = 73213836864. Its totient is φ = 10459119544.

The previous prime is 31377358637. The next prime is 31377358687. The reversal of 31377358644 is 44685377313.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1307389932 + ... + 1307389955.

It is an arithmetic number, because the mean of its divisors is an integer number (6101153072).

Almost surely, 2^31377358644 is an apocalyptic number.

It is an amenable number.

31377358644 is an abundant number, since it is smaller than the sum of its proper divisors (41836478220).

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

31377358644 is a wasteful number, since it uses less digits than its factorization.

31377358644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2614779894 (or 2614779892 counting only the distinct ones).

The product of its digits is 5080320, while the sum is 51.

The spelling of 31377358644 in words is "thirty-one billion, three hundred seventy-seven million, three hundred fifty-eight thousand, six hundred forty-four".