91603072 has 128 divisors (see below), whose sum is σ = 218116800. Its totient is φ = 37847040.

The previous prime is 91603067. The next prime is 91603079. The reversal of 91603072 is 27030619.

It is a tau number, because it is divible by the number of its divisors (128).

It is a super-2 number, since 2×91603072² = 16782245599674368, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 91603072.

It is not an unprimeable number, because it can be changed into a prime (91603079) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1029204 + ... + 1029292.

Almost surely, 2^91603072 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 91603072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (109058400).

91603072 is an abundant number, since it is smaller than the sum of its proper divisors (126513728).

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

91603072 is a wasteful number, since it uses less digits than its factorization.

91603072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174 (or 162 counting only the distinct ones).

The product of its (nonzero) digits is 2268, while the sum is 28.

The square root of 91603072 is about 9570.9493781965. The cubic root of 91603072 is about 450.7855775914.

The spelling of 91603072 in words is "ninety-one million, six hundred three thousand, seventy-two".