91575666 has 96 divisors (see below), whose sum is σ = 250967808. Its totient is φ = 23483520.

The previous prime is 91575661. The next prime is 91575689. The reversal of 91575666 is 66657519.

It is a super-2 number, since 2×91575666² = 16772205206687112, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (91575661) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 59851 + ... + 61361.

It is an arithmetic number, because the mean of its divisors is an integer number (2614248).

Almost surely, 2^91575666 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91575666, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (125483904).

91575666 is an abundant number, since it is smaller than the sum of its proper divisors (159392142).

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

91575666 is a wasteful number, since it uses less digits than its factorization.

91575666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1576 (or 1573 counting only the distinct ones).

The product of its digits is 340200, while the sum is 45.

The square root of 91575666 is about 9569.5175426978. The cubic root of 91575666 is about 450.7406174479.

The spelling of 91575666 in words is "ninety-one million, five hundred seventy-five thousand, six hundred sixty-six".