91644716 has 6 divisors (see below), whose sum is σ = 160378260. Its totient is φ = 45822356.

The previous prime is 91644713. The next prime is 91644731. The reversal of 91644716 is 61744619.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 91644716.

It is not an unprimeable number, because it can be changed into a prime (91644713) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11455586 + ... + 11455593.

It is an arithmetic number, because the mean of its divisors is an integer number (26729710).

Almost surely, 2^91644716 is an apocalyptic number.

It is an amenable number.

91644716 is a deficient number, since it is larger than the sum of its proper divisors (68733544).

91644716 is a wasteful number, since it uses less digits than its factorization.

91644716 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22911183 (or 22911181 counting only the distinct ones).

The product of its digits is 36288, while the sum is 38.

The square root of 91644716 is about 9573.1246727492. The cubic root of 91644716 is about 450.8538783232.

The spelling of 91644716 in words is "ninety-one million, six hundred forty-four thousand, seven hundred sixteen".