91606860 has 72 divisors (see below), whose sum is σ = 286855296. Its totient is φ = 23639040.

The previous prime is 91606799. The next prime is 91606877. The reversal of 91606860 is 6860619.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2629 + ... + 13788.

Almost surely, 2^91606860 is an apocalyptic number.

91606860 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91606860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (143427648).

91606860 is an abundant number, since it is smaller than the sum of its proper divisors (195248436).

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

91606860 is a wasteful number, since it uses less digits than its factorization.

91606860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16463 (or 16458 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 91606860 is about 9571.1472666551. The cubic root of 91606860 is about 450.7917911830.

The spelling of 91606860 in words is "ninety-one million, six hundred six thousand, eight hundred sixty".