79668657 has 16 divisors (see below), whose sum is σ = 118815360. Its totient is φ = 52758000.

The previous prime is 79668643. The next prime is 79668671. The reversal of 79668657 is 75686697.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (79668643) and next prime (79668671).

It is not a de Polignac number, because 79668657 - 2⁷ = 79668529 is a prime.

It is not an unprimeable number, because it can be changed into a prime (79668607) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5694 + ... + 13847.

It is an arithmetic number, because the mean of its divisors is an integer number (7425960).

Almost surely, 2^79668657 is an apocalyptic number.

It is an amenable number.

79668657 is a deficient number, since it is larger than the sum of its proper divisors (39146703).

79668657 is a wasteful number, since it uses less digits than its factorization.

79668657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19701 (or 19695 counting only the distinct ones).

The product of its digits is 3810240, while the sum is 54.

The square root of 79668657 is about 8925.7300541748. The cubic root of 79668657 is about 430.2912341103.

The spelling of 79668657 in words is "seventy-nine million, six hundred sixty-eight thousand, six hundred fifty-seven".