91709668 has 12 divisors (see below), whose sum is σ = 161477680. Its totient is φ = 45573192.

The previous prime is 91709647. The next prime is 91709677. The reversal of 91709668 is 86690719.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 69678 + ... + 70981.

Almost surely, 2^91709668 is an apocalyptic number.

It is an amenable number.

91709668 is a deficient number, since it is larger than the sum of its proper divisors (69768012).

91709668 is a wasteful number, since it uses less digits than its factorization.

91709668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140826 (or 140824 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 46.

The square root of 91709668 is about 9576.5164856539. The cubic root of 91709668 is about 450.9603654434.

The spelling of 91709668 in words is "ninety-one million, seven hundred nine thousand, six hundred sixty-eight".