128967757731 has 12 divisors (see below), whose sum is σ = 186311497320. Its totient is φ = 85967088480.

The previous prime is 128967757727. The next prime is 128967757771. The reversal of 128967757731 is 137757769821.

128967757731 is a `hidden beast` number, since 1 + 28 + 9 + 6 + 7 + 7 + 577 + 31 = 666.

It is not a de Polignac number, because 128967757731 - 2² = 128967757727 is a prime.

It is a super-2 number, since 2×128967757731² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (128967757771) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 879561 + ... + 1015658.

It is an arithmetic number, because the mean of its divisors is an integer number (15525958110).

Almost surely, 2^128967757731 is an apocalyptic number.

128967757731 is a deficient number, since it is larger than the sum of its proper divisors (57343739589).

128967757731 is a wasteful number, since it uses less digits than its factorization.

128967757731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1902786 (or 1902783 counting only the distinct ones).

The product of its digits is 31116960, while the sum is 63.

The spelling of 128967757731 in words is "one hundred twenty-eight billion, nine hundred sixty-seven million, seven hundred fifty-seven thousand, seven hundred thirty-one".