91213068528 has 60 divisors (see below), whose sum is σ = 255290457240. Its totient is φ = 30401908608.

The previous prime is 91213068521. The next prime is 91213068601. The reversal of 91213068528 is 82586031219.

91213068528 is a `hidden beast` number, since 91 + 2 + 1 + 30 + 6 + 8 + 528 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91213068521) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3069550 + ... + 3099122.

It is an arithmetic number, because the mean of its divisors is an integer number (4254840954).

Almost surely, 2^91213068528 is an apocalyptic number.

It is an amenable number.

91213068528 is an abundant number, since it is smaller than the sum of its proper divisors (164077388712).

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

91213068528 is a wasteful number, since it uses less digits than its factorization.

91213068528 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51006 (or 50997 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 45.

The spelling of 91213068528 in words is "ninety-one billion, two hundred thirteen million, sixty-eight thousand, five hundred twenty-eight".