91057768 has 32 divisors (see below), whose sum is σ = 175406400. Its totient is φ = 44299008.

The previous prime is 91057751. The next prime is 91057783. The reversal of 91057768 is 86775019.

It is a super-2 number, since 2×91057768² = 16583034226283648, which contains 22 as substring.

It is a Smith number, since the sum of its digits (43) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47680 + ... + 49552.

It is an arithmetic number, because the mean of its divisors is an integer number (5481450).

Almost surely, 2^91057768 is an apocalyptic number.

It is an amenable number.

91057768 is a deficient number, since it is larger than the sum of its proper divisors (84348632).

91057768 is a wasteful number, since it uses less digits than its factorization.

91057768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2041 (or 2037 counting only the distinct ones).

The product of its (nonzero) digits is 105840, while the sum is 43.

The square root of 91057768 is about 9542.4193997120. The cubic root of 91057768 is about 449.8893028126.

The spelling of 91057768 in words is "ninety-one million, fifty-seven thousand, seven hundred sixty-eight".