91857933970 has 64 divisors (see below), whose sum is σ = 185223894912. Its totient is φ = 32516352000.

The previous prime is 91857933917. The next prime is 91857933971. The reversal of 91857933970 is 7933975819.

It is a Harshad number since it is a multiple of its sum of digits (61).

It is a junction number, because it is equal to n+sod(n) for n = 91857933899 and 91857933908.

It is not an unprimeable number, because it can be changed into a prime (91857933971) 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, 580305 + ... + 721435.

It is an arithmetic number, because the mean of its divisors is an integer number (2894123358).

Almost surely, 2^91857933970 is an apocalyptic number.

91857933970 is an abundant number, since it is smaller than the sum of its proper divisors (93365960942).

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

91857933970 is a wasteful number, since it uses less digits than its factorization.

91857933970 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141307.

The product of its (nonzero) digits is 12859560, while the sum is 61.

The spelling of 91857933970 in words is "ninety-one billion, eight hundred fifty-seven million, nine hundred thirty-three thousand, nine hundred seventy".