91664347 has 8 divisors (see below), whose sum is σ = 95388480. Its totient is φ = 88012680.

The previous prime is 91664327. The next prime is 91664351. The reversal of 91664347 is 74346619.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91664347 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91664317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15529 + ... + 20602.

It is an arithmetic number, because the mean of its divisors is an integer number (11923560).

Almost surely, 2^91664347 is an apocalyptic number.

91664347 is a deficient number, since it is larger than the sum of its proper divisors (3724133).

91664347 is a wasteful number, since it uses less digits than its factorization.

91664347 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36233.

The product of its digits is 108864, while the sum is 40.

The square root of 91664347 is about 9574.1499361562. The cubic root of 91664347 is about 450.8860681427.

The spelling of 91664347 in words is "ninety-one million, six hundred sixty-four thousand, three hundred forty-seven".