91087748 has 12 divisors (see below), whose sum is σ = 167793360. Its totient is φ = 43146792.

The previous prime is 91087699. The next prime is 91087757. The reversal of 91087748 is 84778019.

It is a junction number, because it is equal to n+sod(n) for n = 91087699 and 91087708.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 599186 + ... + 599337.

It is an arithmetic number, because the mean of its divisors is an integer number (13982780).

Almost surely, 2^91087748 is an apocalyptic number.

It is an amenable number.

91087748 is a deficient number, since it is larger than the sum of its proper divisors (76705612).

91087748 is a wasteful number, since it uses less digits than its factorization.

91087748 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1198546 (or 1198544 counting only the distinct ones).

The product of its (nonzero) digits is 112896, while the sum is 44.

The square root of 91087748 is about 9543.9901508751. The cubic root of 91087748 is about 449.9386714776.

The spelling of 91087748 in words is "ninety-one million, eighty-seven thousand, seven hundred forty-eight".