91757442 has 96 divisors (see below), whose sum is σ = 228805632. Its totient is φ = 23972256.

The previous prime is 91757431. The next prime is 91757443. The reversal of 91757442 is 24475719.

It is a self number, because there is not a number n which added to its sum of digits gives 91757442.

It is not an unprimeable number, because it can be changed into a prime (91757443) 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, 1952263 + ... + 1952309.

It is an arithmetic number, because the mean of its divisors is an integer number (2383392).

Almost surely, 2^91757442 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91757442, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (114402816).

91757442 is an abundant number, since it is smaller than the sum of its proper divisors (137048190).

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

91757442 is a wasteful number, since it uses less digits than its factorization.

91757442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172 (or 125 counting only the distinct ones).

The product of its digits is 70560, while the sum is 39.

The square root of 91757442 is about 9579.0104916948. The cubic root of 91757442 is about 451.0386575910.

The spelling of 91757442 in words is "ninety-one million, seven hundred fifty-seven thousand, four hundred forty-two".