91680838 has 16 divisors (see below), whose sum is σ = 141359904. Its totient is φ = 44568640.

The previous prime is 91680791. The next prime is 91680851. The reversal of 91680838 is 83808619.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 91680794 and 91680803.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24231 + ... + 27757.

It is an arithmetic number, because the mean of its divisors is an integer number (8834994).

Almost surely, 2^91680838 is an apocalyptic number.

91680838 is a deficient number, since it is larger than the sum of its proper divisors (49679066).

91680838 is a wasteful number, since it uses less digits than its factorization.

91680838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3887.

The product of its (nonzero) digits is 82944, while the sum is 43.

The square root of 91680838 is about 9575.0111227089. The cubic root of 91680838 is about 450.9131056135.

The spelling of 91680838 in words is "ninety-one million, six hundred eighty thousand, eight hundred thirty-eight".