91636567920 has 160 divisors (see below), whose sum is σ = 325819146240. Its totient is φ = 23648129280.

The previous prime is 91636567909. The next prime is 91636567943. The reversal of 91636567920 is 2976563619.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 617304 + ... + 751223.

It is an arithmetic number, because the mean of its divisors is an integer number (2036369664).

Almost surely, 2^91636567920 is an apocalyptic number.

91636567920 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

91636567920 is an abundant number, since it is smaller than the sum of its proper divisors (234182578320).

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

91636567920 is a wasteful number, since it uses less digits than its factorization.

91636567920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1368580 (or 1368568 counting only the distinct ones).

The product of its (nonzero) digits is 3674160, while the sum is 54.

The spelling of 91636567920 in words is "ninety-one billion, six hundred thirty-six million, five hundred sixty-seven thousand, nine hundred twenty".