91373616 has 80 divisors (see below), whose sum is σ = 270776320. Its totient is φ = 29471040.

The previous prime is 91373587. The next prime is 91373617. The reversal of 91373616 is 61637319.

91373616 is a `hidden beast` number, since 9 + 1 + 37 + 3 + 616 = 666.

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 (91373617) 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, 9981 + ... + 16803.

It is an arithmetic number, because the mean of its divisors is an integer number (3384704).

Almost surely, 2^91373616 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 91373616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (135388160).

91373616 is an abundant number, since it is smaller than the sum of its proper divisors (179402704).

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

91373616 is a wasteful number, since it uses less digits than its factorization.

91373616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6871 (or 6859 counting only the distinct ones).

The product of its digits is 20412, while the sum is 36.

The square root of 91373616 is about 9558.9547545744. The cubic root of 91373616 is about 450.4088728275.

It can be divided in two parts, 913 and 73616, that added together give a square (74529 = 273²).

The spelling of 91373616 in words is "ninety-one million, three hundred seventy-three thousand, six hundred sixteen".