91975940 has 72 divisors (see below), whose sum is σ = 226759680. Its totient is φ = 31243968.

The previous prime is 91975921. The next prime is 91975943. The reversal of 91975940 is 4957919.

It is a junction number, because it is equal to n+sod(n) for n = 91975891 and 91975900.

It is not an unprimeable number, because it can be changed into a prime (91975943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 124091 + ... + 124829.

It is an arithmetic number, because the mean of its divisors is an integer number (3149440).

Almost surely, 2^91975940 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91975940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (113379840).

91975940 is an abundant number, since it is smaller than the sum of its proper divisors (134783740).

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

91975940 is a wasteful number, since it uses less digits than its factorization.

91975940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 889 (or 880 counting only the distinct ones).

The product of its (nonzero) digits is 102060, while the sum is 44.

The square root of 91975940 is about 9590.4087504131. The cubic root of 91975940 is about 451.3963866961.

The spelling of 91975940 in words is "ninety-one million, nine hundred seventy-five thousand, nine hundred forty".