91665800 has 36 divisors (see below), whose sum is σ = 213438255. Its totient is φ = 36612160.

The previous prime is 91665797. The next prime is 91665803. The reversal of 91665800 is 856619.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It is an interprime number because it is at equal distance from previous prime (91665797) and next prime (91665803).

It can be written as a sum of positive squares in 5 ways, for example, as 87347716 + 4318084 = 9346^2 + 2078^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=6770.

It is not an unprimeable number, because it can be changed into a prime (91665803) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 135062 + ... + 135738.

Almost surely, 2^91665800 is an apocalyptic number.

It is an amenable number.

91665800 is an abundant number, since it is smaller than the sum of its proper divisors (121772455).

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

91665800 is an equidigital number, since it uses as much as digits as its factorization.

91665800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1370 (or 684 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 35.

The square root of 91665800 is about 9574.2258172659. The cubic root of 91665800 is about 450.8884505085. Note that the first 3 decimals are identical.

The spelling of 91665800 in words is "ninety-one million, six hundred sixty-five thousand, eight hundred".