91056578 has 16 divisors (see below), whose sum is σ = 144305280. Its totient is φ = 43021776.

The previous prime is 91056571. The next prime is 91056611. The reversal of 91056578 is 87565019.

It is not an unprimeable number, because it can be changed into a prime (91056571) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13976 + ... + 19427.

It is an arithmetic number, because the mean of its divisors is an integer number (9019080).

Almost surely, 2^91056578 is an apocalyptic number.

91056578 is a deficient number, since it is larger than the sum of its proper divisors (53248702).

91056578 is a wasteful number, since it uses less digits than its factorization.

91056578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33481.

The product of its (nonzero) digits is 75600, while the sum is 41.

The square root of 91056578 is about 9542.3570463487. The cubic root of 91056578 is about 449.8873429922.

The spelling of 91056578 in words is "ninety-one million, fifty-six thousand, five hundred seventy-eight".