91242774 has 80 divisors (see below), whose sum is σ = 247455648. Its totient is φ = 24530688.

The previous prime is 91242761. The next prime is 91242779. The reversal of 91242774 is 47724219.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91242779) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 16912 + ... + 21644.

Almost surely, 2^91242774 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91242774, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (123727824).

91242774 is an abundant number, since it is smaller than the sum of its proper divisors (156212874).

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

91242774 is a wasteful number, since it uses less digits than its factorization.

91242774 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4771 (or 4762 counting only the distinct ones).

The product of its digits is 28224, while the sum is 36.

The square root of 91242774 is about 9552.1083536568. The cubic root of 91242774 is about 450.1937832060.

The spelling of 91242774 in words is "ninety-one million, two hundred forty-two thousand, seven hundred seventy-four".