91973616 has 80 divisors (see below), whose sum is σ = 280934400. Its totient is φ = 25369344.

The previous prime is 91973611. The next prime is 91973627. The reversal of 91973616 is 61637919.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91973611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5025 + ... + 14463.

It is an arithmetic number, because the mean of its divisors is an integer number (3511680).

Almost surely, 2^91973616 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 91973616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (140467200).

91973616 is an abundant number, since it is smaller than the sum of its proper divisors (188960784).

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

91973616 is a wasteful number, since it uses less digits than its factorization.

91973616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9486 (or 9480 counting only the distinct ones).

The product of its digits is 61236, while the sum is 42.

The square root of 91973616 is about 9590.2875869288. The cubic root of 91973616 is about 451.3925847813.

The spelling of 91973616 in words is "ninety-one million, nine hundred seventy-three thousand, six hundred sixteen".