79577681 has 4 divisors (see below), whose sum is σ = 83766000. Its totient is φ = 75389364.

The previous prime is 79577669. The next prime is 79577689. The reversal of 79577681 is 18677597.

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: 18677597 = 149 ⋅125353.

It is a cyclic number.

It is not a de Polignac number, because 79577681 - 2¹⁰ = 79576657 is a prime.

It is a super-2 number, since 2×79577681² = 12665214626675522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79577689) 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, 2094131 + ... + 2094168.

It is an arithmetic number, because the mean of its divisors is an integer number (20941500).

Almost surely, 2^79577681 is an apocalyptic number.

It is an amenable number.

79577681 is a deficient number, since it is larger than the sum of its proper divisors (4188319).

79577681 is a wasteful number, since it uses less digits than its factorization.

79577681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4188318.

The product of its digits is 740880, while the sum is 50.

The square root of 79577681 is about 8920.6323206374. The cubic root of 79577681 is about 430.1273842896.

The spelling of 79577681 in words is "seventy-nine million, five hundred seventy-seven thousand, six hundred eighty-one".