91680574 has 4 divisors (see below), whose sum is σ = 137520864. Its totient is φ = 45840286.

The previous prime is 91680569. The next prime is 91680577. The reversal of 91680574 is 47508619.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91680577) 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 as a sum of consecutive naturals, namely, 22920142 + ... + 22920145.

It is an arithmetic number, because the mean of its divisors is an integer number (34380216).

Almost surely, 2^91680574 is an apocalyptic number.

91680574 is a deficient number, since it is larger than the sum of its proper divisors (45840290).

91680574 is a wasteful number, since it uses less digits than its factorization.

91680574 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45840289.

The product of its (nonzero) digits is 60480, while the sum is 40.

The square root of 91680574 is about 9574.9973368143. The cubic root of 91680574 is about 450.9126728034.

The spelling of 91680574 in words is "ninety-one million, six hundred eighty thousand, five hundred seventy-four".