91660608 has 84 divisors (see below), whose sum is σ = 282961588. Its totient is φ = 28200960.

The previous prime is 91660567. The next prime is 91660643. The reversal of 91660608 is 80606619.

It can be written as a sum of positive squares in 2 ways, for example, as 18249984 + 73410624 = 4272^2 + 8568^2 .

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1368 + ... + 13608.

Almost surely, 2^91660608 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 91660608, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (141480794).

91660608 is an abundant number, since it is smaller than the sum of its proper divisors (191300980).

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

91660608 is a wasteful number, since it uses less digits than its factorization.

91660608 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12272 (or 12259 counting only the distinct ones).

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

The square root of 91660608 is about 9573.9546687876. The cubic root of 91660608 is about 450.8799374933.

The spelling of 91660608 in words is "ninety-one million, six hundred sixty thousand, six hundred eight".