79769729 has 8 divisors (see below), whose sum is σ = 90959400. Its totient is φ = 69302016.

The previous prime is 79769719. The next prime is 79769759. The reversal of 79769729 is 92796797.

It can be written as a sum of positive squares in 4 ways, for example, as 78400 + 79691329 = 280^2 + 8927^2 .

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 79769729 - 2⁴ = 79769713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79769719) 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, 180254 + ... + 180695.

It is an arithmetic number, because the mean of its divisors is an integer number (11369925).

Almost surely, 2^79769729 is an apocalyptic number.

It is an amenable number.

79769729 is a deficient number, since it is larger than the sum of its proper divisors (11189671).

79769729 is a wasteful number, since it uses less digits than its factorization.

79769729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 360979.

The product of its digits is 3000564, while the sum is 56.

The square root of 79769729 is about 8931.3900933729. The cubic root of 79769729 is about 430.4731208512.

The spelling of 79769729 in words is "seventy-nine million, seven hundred sixty-nine thousand, seven hundred twenty-nine".