91977960930 has 64 divisors (see below), whose sum is σ = 235023804288. Its totient is φ = 22957102080.

The previous prime is 91977960923. The next prime is 91977960937. The reversal of 91977960930 is 3906977919.

It is an interprime number because it is at equal distance from previous prime (91977960923) and next prime (91977960937).

It is not an unprimeable number, because it can be changed into a prime (91977960937) 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 31 ways as a sum of consecutive naturals, for example, 405892 + ... + 590511.

It is an arithmetic number, because the mean of its divisors is an integer number (3672246942).

Almost surely, 2^91977960930 is an apocalyptic number.

91977960930 is an abundant number, since it is smaller than the sum of its proper divisors (143045843358).

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

91977960930 is a wasteful number, since it uses less digits than its factorization.

91977960930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 996611.

The product of its (nonzero) digits is 5786802, while the sum is 60.

The spelling of 91977960930 in words is "ninety-one billion, nine hundred seventy-seven million, nine hundred sixty thousand, nine hundred thirty".