91815248 has 80 divisors (see below), whose sum is σ = 210343680. Its totient is φ = 38016000.

The previous prime is 91815233. The next prime is 91815271. The reversal of 91815248 is 84251819.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 607973 + ... + 608123.

It is an arithmetic number, because the mean of its divisors is an integer number (2629296).

Almost surely, 2^91815248 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91815248, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (105171840).

91815248 is an abundant number, since it is smaller than the sum of its proper divisors (118528432).

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

91815248 is a wasteful number, since it uses less digits than its factorization.

91815248 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 316 (or 310 counting only the distinct ones).

The product of its digits is 23040, while the sum is 38.

The square root of 91815248 is about 9582.0273428957. The cubic root of 91815248 is about 451.1333538788.

The spelling of 91815248 in words is "ninety-one million, eight hundred fifteen thousand, two hundred forty-eight".