91365788 has 6 divisors (see below), whose sum is σ = 159890136. Its totient is φ = 45682892.

The previous prime is 91365787. The next prime is 91365793. The reversal of 91365788 is 88756319.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91365787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11420720 + ... + 11420727.

It is an arithmetic number, because the mean of its divisors is an integer number (26648356).

Almost surely, 2^91365788 is an apocalyptic number.

It is an amenable number.

91365788 is a deficient number, since it is larger than the sum of its proper divisors (68524348).

91365788 is a wasteful number, since it uses less digits than its factorization.

91365788 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22841451 (or 22841449 counting only the distinct ones).

The product of its digits is 362880, while the sum is 47.

The square root of 91365788 is about 9558.5452868101. The cubic root of 91365788 is about 450.3960102475.

The spelling of 91365788 in words is "ninety-one million, three hundred sixty-five thousand, seven hundred eighty-eight".