91875864 has 64 divisors (see below), whose sum is σ = 237219840. Its totient is φ = 29635200.

The previous prime is 91875863. The next prime is 91875877. The reversal of 91875864 is 46857819.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91875863) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 130714 + ... + 131414.

It is an arithmetic number, because the mean of its divisors is an integer number (3706560).

Almost surely, 2^91875864 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 91875864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (118609920).

91875864 is an abundant number, since it is smaller than the sum of its proper divisors (145343976).

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

91875864 is a wasteful number, since it uses less digits than its factorization.

91875864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 880 (or 876 counting only the distinct ones).

The product of its digits is 483840, while the sum is 48.

The square root of 91875864 is about 9585.1898259763. The cubic root of 91875864 is about 451.2326107535.

It can be divided in two parts, 9187 and 5864, that added together give a palindrome (15051).

The spelling of 91875864 in words is "ninety-one million, eight hundred seventy-five thousand, eight hundred sixty-four".