91128048 has 80 divisors (see below), whose sum is σ = 259376256. Its totient is φ = 27339520.

The previous prime is 91128029. The next prime is 91128053. The reversal of 91128048 is 84082119.

It is a super-2 number, since 2×91128048² = 16608642264580608, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

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, 55690 + ... + 57302.

Almost surely, 2^91128048 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 91128048, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (129688128).

91128048 is an abundant number, since it is smaller than the sum of its proper divisors (168248208).

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

91128048 is a wasteful number, since it uses less digits than its factorization.

91128048 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1742 (or 1736 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 33.

The square root of 91128048 is about 9546.1011936811. The cubic root of 91128048 is about 450.0050172280.

The spelling of 91128048 in words is "ninety-one million, one hundred twenty-eight thousand, forty-eight".