91135872 has 48 divisors (see below), whose sum is σ = 262256280. Its totient is φ = 30378240.

The previous prime is 91135871. The next prime is 91135873. The reversal of 91135872 is 27853119.

It is an interprime number because it is at equal distance from previous prime (91135871) and next prime (91135873).

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91135871) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 38404 + ... + 40707.

Almost surely, 2^91135872 is an apocalyptic number.

It is an amenable number.

91135872 is an abundant number, since it is smaller than the sum of its proper divisors (171120408).

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

91135872 is a wasteful number, since it uses less digits than its factorization.

91135872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79131 (or 79116 counting only the distinct ones).

The product of its digits is 15120, while the sum is 36.

The square root of 91135872 is about 9546.5109856952. The cubic root of 91135872 is about 450.0178955846.

The spelling of 91135872 in words is "ninety-one million, one hundred thirty-five thousand, eight hundred seventy-two".