91244788 has 24 divisors (see below), whose sum is σ = 166670280. Its totient is φ = 43653120.

The previous prime is 91244779. The next prime is 91244809. The reversal of 91244788 is 88744219.

It can be written as a sum of positive squares in 4 ways, for example, as 4717584 + 86527204 = 2172^2 + 9302^2 .

It is a super-2 number, since 2×91244788² = 16651222674329888, which contains 22 as substring.

It is a congruent number.

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, 9628 + ... + 16588.

It is an arithmetic number, because the mean of its divisors is an integer number (6944595).

Almost surely, 2^91244788 is an apocalyptic number.

It is an amenable number.

91244788 is a deficient number, since it is larger than the sum of its proper divisors (75425492).

91244788 is a wasteful number, since it uses less digits than its factorization.

91244788 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7107 (or 7105 counting only the distinct ones).

The product of its digits is 129024, while the sum is 43.

The square root of 91244788 is about 9552.2137748273. The cubic root of 91244788 is about 450.1970955545.

The spelling of 91244788 in words is "ninety-one million, two hundred forty-four thousand, seven hundred eighty-eight".