79143681 has 16 divisors (see below), whose sum is σ = 108319680. Its totient is φ = 51380160.

The previous prime is 79143671. The next prime is 79143707. The reversal of 79143681 is 18634197.

It is not a de Polignac number, because 79143681 - 2⁷ = 79143553 is a prime.

It is a super-2 number, since 2×79143681² = 12527444484459522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (79143611) 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, 20311 + ... + 23891.

It is an arithmetic number, because the mean of its divisors is an integer number (6769980).

Almost surely, 2^79143681 is an apocalyptic number.

It is an amenable number.

79143681 is a deficient number, since it is larger than the sum of its proper divisors (29175999).

79143681 is a wasteful number, since it uses less digits than its factorization.

79143681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3776.

The product of its digits is 36288, while the sum is 39.

The square root of 79143681 is about 8896.2734332978. The cubic root of 79143681 is about 429.3440169054.

The spelling of 79143681 in words is "seventy-nine million, one hundred forty-three thousand, six hundred eighty-one".