91775568 has 20 divisors (see below), whose sum is σ = 237087008. Its totient is φ = 30591840.

The previous prime is 91775557. The next prime is 91775599. The reversal of 91775568 is 86557719.

It is a Harshad number since it is a multiple of its sum of digits (48), and also a Moran number because the ratio is a prime number: 1911991 = 91775568 / (9 + 1 + 7 + 7 + 5 + 5 + 6 + 8).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 955948 + ... + 956043.

Almost surely, 2^91775568 is an apocalyptic number.

It is an amenable number.

91775568 is an abundant number, since it is smaller than the sum of its proper divisors (145311440).

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

91775568 is a wasteful number, since it uses less digits than its factorization.

91775568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1912002 (or 1911996 counting only the distinct ones).

The product of its digits is 529200, while the sum is 48.

The square root of 91775568 is about 9579.9565761020. The cubic root of 91775568 is about 451.0683554126.

The spelling of 91775568 in words is "ninety-one million, seven hundred seventy-five thousand, five hundred sixty-eight".