79718081 has 4 divisors (see below), whose sum is σ = 82289664. Its totient is φ = 77146500.

The previous prime is 79718057. The next prime is 79718099. The reversal of 79718081 is 18081797.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 18081797 = 151 ⋅119747.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-79718081 is a prime.

It is a super-2 number, since 2×79718081² = 12709944876645122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79718021) 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, 1285745 + ... + 1285806.

It is an arithmetic number, because the mean of its divisors is an integer number (20572416).

Almost surely, 2^79718081 is an apocalyptic number.

It is an amenable number.

79718081 is a deficient number, since it is larger than the sum of its proper divisors (2571583).

79718081 is a wasteful number, since it uses less digits than its factorization.

79718081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2571582.

The product of its (nonzero) digits is 28224, while the sum is 41.

The square root of 79718081 is about 8928.4982499858. The cubic root of 79718081 is about 430.3801955602.

The spelling of 79718081 in words is "seventy-nine million, seven hundred eighteen thousand, eighty-one".