31442457728 has 32 divisors (see below), whose sum is σ = 68333753520. Its totient is φ = 14292025600.

The previous prime is 31442457679. The next prime is 31442457731. The reversal of 31442457728 is 82775424413.

It is a tau number, because it is divible by the number of its divisors (32).

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, 11164238 + ... + 11167053.

Almost surely, 2^31442457728 is an apocalyptic number.

It is an amenable number.

31442457728 is an abundant number, since it is smaller than the sum of its proper divisors (36891295792).

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

31442457728 is a wasteful number, since it uses less digits than its factorization.

31442457728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22331316 (or 22331304 counting only the distinct ones).

The product of its digits is 1505280, while the sum is 47.

The spelling of 31442457728 in words is "thirty-one billion, four hundred forty-two million, four hundred fifty-seven thousand, seven hundred twenty-eight".