91940674128 has 20 divisors (see below), whose sum is σ = 237513408288. Its totient is φ = 30646891360.

The previous prime is 91940674127. The next prime is 91940674151. The reversal of 91940674128 is 82147604919.

It is a super-2 number, since 2×91940674128² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91940674127) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 957715308 + ... + 957715403.

Almost surely, 2^91940674128 is an apocalyptic number.

It is an amenable number.

91940674128 is an abundant number, since it is smaller than the sum of its proper divisors (145572734160).

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

91940674128 is a wasteful number, since it uses less digits than its factorization.

91940674128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1915430722 (or 1915430716 counting only the distinct ones).

The product of its (nonzero) digits is 870912, while the sum is 51.

The spelling of 91940674128 in words is "ninety-one billion, nine hundred forty million, six hundred seventy-four thousand, one hundred twenty-eight".