91662870 has 64 divisors (see below), whose sum is σ = 240859584. Its totient is φ = 22187520.

The previous prime is 91662833. The next prime is 91662871. The reversal of 91662870 is 7826619.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91662871) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 21864 + ... + 25716.

It is an arithmetic number, because the mean of its divisors is an integer number (3763431).

Almost surely, 2^91662870 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91662870, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (120429792).

91662870 is an abundant number, since it is smaller than the sum of its proper divisors (149196714).

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

91662870 is a wasteful number, since it uses less digits than its factorization.

91662870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3937.

The product of its (nonzero) digits is 36288, while the sum is 39.

The square root of 91662870 is about 9574.0728010602. The cubic root of 91662870 is about 450.8836464004.

The spelling of 91662870 in words is "ninety-one million, six hundred sixty-two thousand, eight hundred seventy".