31750138428 has 12 divisors (see below), whose sum is σ = 74083656360. Its totient is φ = 10583379472.

The previous prime is 31750138397. The next prime is 31750138447. The reversal of 31750138428 is 82483105713.

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

It is a super-2 number, since 2×31750138428² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 31750138428.

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, 1322922423 + ... + 1322922446.

It is an arithmetic number, because the mean of its divisors is an integer number (6173638030).

Almost surely, 2^31750138428 is an apocalyptic number.

It is an amenable number.

31750138428 is an abundant number, since it is smaller than the sum of its proper divisors (42333517932).

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

31750138428 is a wasteful number, since it uses less digits than its factorization.

31750138428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2645844876 (or 2645844874 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 42.

The spelling of 31750138428 in words is "thirty-one billion, seven hundred fifty million, one hundred thirty-eight thousand, four hundred twenty-eight".