79679969 has 8 divisors (see below), whose sum is σ = 85751208. Its totient is φ = 73762560.

The previous prime is 79679959. The next prime is 79679983. The reversal of 79679969 is 96997697.

It can be written as a sum of positive squares in 4 ways, for example, as 3763600 + 75916369 = 1940^2 + 8713^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 79679969 - 2¹⁶ = 79614433 is a prime.

It is a super-2 number, since 2×79679969² = 12697794919681922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79679959) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37382 + ... + 39455.

It is an arithmetic number, because the mean of its divisors is an integer number (10718901).

Almost surely, 2^79679969 is an apocalyptic number.

It is an amenable number.

79679969 is a deficient number, since it is larger than the sum of its proper divisors (6071239).

79679969 is a wasteful number, since it uses less digits than its factorization.

79679969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76915.

The product of its digits is 11573604, while the sum is 62.

The square root of 79679969 is about 8926.3637053394. The cubic root of 79679969 is about 430.3115985558.

It can be divided in two parts, 79679 and 969, that multiplied together give a triangular number (77208951 = T₁₂₄₂₆).

The spelling of 79679969 in words is "seventy-nine million, six hundred seventy-nine thousand, nine hundred sixty-nine".