91057842 has 48 divisors (see below), whose sum is σ = 208965120. Its totient is φ = 28576800.

The previous prime is 91057829. The next prime is 91057859. The reversal of 91057842 is 24875019.

It is a junction number, because it is equal to n+sod(n) for n = 91057797 and 91057806.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 61167 + ... + 62637.

It is an arithmetic number, because the mean of its divisors is an integer number (4353440).

Almost surely, 2^91057842 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91057842, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (104482560).

91057842 is an abundant number, since it is smaller than the sum of its proper divisors (117907278).

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

91057842 is a wasteful number, since it uses less digits than its factorization.

91057842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1679 (or 1676 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The square root of 91057842 is about 9542.4232771346. The cubic root of 91057842 is about 449.8894246832.

The spelling of 91057842 in words is "ninety-one million, fifty-seven thousand, eight hundred forty-two".