91038995640 has 96 divisors (see below), whose sum is σ = 295936804800. Its totient is φ = 24272136960.

The previous prime is 91038995573. The next prime is 91038995681. The reversal of 91038995640 is 4659983019.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 1963930 + ... + 2009750.

It is an arithmetic number, because the mean of its divisors is an integer number (3082675050).

Almost surely, 2^91038995640 is an apocalyptic number.

91038995640 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

91038995640 is an abundant number, since it is smaller than the sum of its proper divisors (204897809160).

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

91038995640 is a wasteful number, since it uses less digits than its factorization.

91038995640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51357 (or 51350 counting only the distinct ones).

The product of its (nonzero) digits is 2099520, while the sum is 54.

The spelling of 91038995640 in words is "ninety-one billion, thirty-eight million, nine hundred ninety-five thousand, six hundred forty".