91680767 has 4 divisors (see below), whose sum is σ = 91772640. Its totient is φ = 91588896.

The previous prime is 91680763. The next prime is 91680781. The reversal of 91680767 is 76708619.

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

It is a cyclic number.

It is not a de Polignac number, because 91680767 - 2² = 91680763 is a prime.

It is a super-3 number, since 3×91680767³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91680763) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44423 + ... + 46440.

It is an arithmetic number, because the mean of its divisors is an integer number (22943160).

Almost surely, 2^91680767 is an apocalyptic number.

91680767 is a deficient number, since it is larger than the sum of its proper divisors (91873).

91680767 is a wasteful number, since it uses less digits than its factorization.

91680767 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91872.

The product of its (nonzero) digits is 127008, while the sum is 44.

The square root of 91680767 is about 9575.0074151407. The cubic root of 91680767 is about 450.9129892139.

The spelling of 91680767 in words is "ninety-one million, six hundred eighty thousand, seven hundred sixty-seven".