79767681 has 32 divisors (see below), whose sum is σ = 132096000. Its totient is φ = 41783040.

The previous prime is 79767647. The next prime is 79767683. The reversal of 79767681 is 18676797.

It is a happy number.

It is not a de Polignac number, because 79767681 - 2¹⁰ = 79766657 is a prime.

It is a super-2 number, since 2×79767681² = 12725765864235522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (79767683) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9145 + ... + 15593.

It is an arithmetic number, because the mean of its divisors is an integer number (4128000).

Almost surely, 2^79767681 is an apocalyptic number.

It is an amenable number.

79767681 is a deficient number, since it is larger than the sum of its proper divisors (52328319).

79767681 is a wasteful number, since it uses less digits than its factorization.

79767681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6509.

The product of its digits is 889056, while the sum is 51.

The square root of 79767681 is about 8931.2754408315. The cubic root of 79767681 is about 430.4694368452.

The spelling of 79767681 in words is "seventy-nine million, seven hundred sixty-seven thousand, six hundred eighty-one".