91072896 has 48 divisors (see below), whose sum is σ = 242410140. Its totient is φ = 30295296.

The previous prime is 91072889. The next prime is 91072901. The reversal of 91072896 is 69827019.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 186765 + ... + 187251.

Almost surely, 2^91072896 is an apocalyptic number.

91072896 is a gapful number since it is divisible by the number (96) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91072896, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (121205070).

91072896 is an abundant number, since it is smaller than the sum of its proper divisors (151337244).

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

91072896 is an frugal number, since it uses more digits than its factorization.

91072896 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 991 (or 492 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 42.

The square root of 91072896 is about 9543.2120378833. The cubic root of 91072896 is about 449.9142157466.

The spelling of 91072896 in words is "ninety-one million, seventy-two thousand, eight hundred ninety-six".