91613088 has 144 divisors (see below), whose sum is σ = 308206080. Its totient is φ = 25256448.

The previous prime is 91613087. The next prime is 91613089. The reversal of 91613088 is 88031619.

It is an interprime number because it is at equal distance from previous prime (91613087) and next prime (91613089).

It is a tau number, because it is divible by the number of its divisors (144).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (91613087) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 57681 + ... + 59247.

It is an arithmetic number, because the mean of its divisors is an integer number (2140320).

Almost surely, 2^91613088 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 91613088, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (154103040).

91613088 is an abundant number, since it is smaller than the sum of its proper divisors (216592992).

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

91613088 is a wasteful number, since it uses less digits than its factorization.

91613088 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1619 (or 1608 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The square root of 91613088 is about 9571.4726139712. The cubic root of 91613088 is about 450.8020068213.

The spelling of 91613088 in words is "ninety-one million, six hundred thirteen thousand, eighty-eight".