91442688 has 80 divisors (see below), whose sum is σ = 250348560. Its totient is φ = 29638656.

The previous prime is 91442657. The next prime is 91442693. The reversal of 91442688 is 88624419.

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 7 ways as a sum of consecutive naturals, for example, 56028 + ... + 57636.

It is an arithmetic number, because the mean of its divisors is an integer number (3129357).

Almost surely, 2^91442688 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 91442688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (125174280).

91442688 is an abundant number, since it is smaller than the sum of its proper divisors (158905872).

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

91442688 is a wasteful number, since it uses less digits than its factorization.

91442688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1667 (or 1651 counting only the distinct ones).

The product of its digits is 110592, while the sum is 42.

The square root of 91442688 is about 9562.5670193730. The cubic root of 91442688 is about 450.5223366740.

The spelling of 91442688 in words is "ninety-one million, four hundred forty-two thousand, six hundred eighty-eight".