31938799788918 has 96 divisors (see below), whose sum is σ = 75722704211232. Its totient is φ = 9648814694400.

The previous prime is 31938799788859. The next prime is 31938799788919. The reversal of 31938799788918 is 81988799783913.

It is a super-2 number, since 2×31938799788918² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31938799788919) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1275855330 + ... + 1275880362.

It is an arithmetic number, because the mean of its divisors is an integer number (788778168867).

Almost surely, 2^{31938799788918} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31938799788918, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37861352105616).

31938799788918 is an abundant number, since it is smaller than the sum of its proper divisors (43783904422314).

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

31938799788918 is a wasteful number, since it uses less digits than its factorization.

31938799788918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44510 (or 44507 counting only the distinct ones).

The product of its digits is 11851370496, while the sum is 90.

The spelling of 31938799788918 in words is "thirty-one trillion, nine hundred thirty-eight billion, seven hundred ninety-nine million, seven hundred eighty-eight thousand, nine hundred eighteen".