91290056 has 64 divisors (see below), whose sum is σ = 202608000. Its totient is φ = 38016000.

The previous prime is 91290047. The next prime is 91290091. The reversal of 91290056 is 65009219.

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 227456 + ... + 227856.

It is an arithmetic number, because the mean of its divisors is an integer number (3165750).

Almost surely, 2^91290056 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 91290056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (101304000).

91290056 is an abundant number, since it is smaller than the sum of its proper divisors (111317944).

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

91290056 is a wasteful number, since it uses less digits than its factorization.

91290056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 630 (or 626 counting only the distinct ones).

The product of its (nonzero) digits is 4860, while the sum is 32.

The square root of 91290056 is about 9554.5829840972. The cubic root of 91290056 is about 450.2715332413.

The spelling of 91290056 in words is "ninety-one million, two hundred ninety thousand, fifty-six".