73131113128 has 32 divisors (see below), whose sum is σ = 147647577600. Its totient is φ = 33831338752.

The previous prime is 73131113101. The next prime is 73131113137. The reversal of 73131113128 is 82131113137.

It is a self number, because there is not a number n which added to its sum of digits gives 73131113128.

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, 4549000 + ... + 4565047.

It is an arithmetic number, because the mean of its divisors is an integer number (4613986800).

Almost surely, 2^73131113128 is an apocalyptic number.

It is an amenable number.

73131113128 is an abundant number, since it is smaller than the sum of its proper divisors (74516464472).

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

73131113128 is a wasteful number, since it uses less digits than its factorization.

73131113128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9114129 (or 9114125 counting only the distinct ones).

The product of its digits is 3024, while the sum is 31.

Subtracting 73131113128 from its reverse (82131113137), we obtain a palindrome (9000000009).

The spelling of 73131113128 in words is "seventy-three billion, one hundred thirty-one million, one hundred thirteen thousand, one hundred twenty-eight".