91426640920 has 32 divisors (see below), whose sum is σ = 205744263120. Its totient is φ = 36564554880.

The previous prime is 91426640909. The next prime is 91426640927. The reversal of 91426640920 is 2904662419.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91426640927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56014 + ... + 431266.

Almost surely, 2^91426640920 is an apocalyptic number.

It is an amenable number.

91426640920 is an abundant number, since it is smaller than the sum of its proper divisors (114317622200).

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

91426640920 is a wasteful number, since it uses less digits than its factorization.

91426640920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 381355 (or 381351 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 43.

The spelling of 91426640920 in words is "ninety-one billion, four hundred twenty-six million, six hundred forty thousand, nine hundred twenty".