79729517 has 6 divisors (see below), whose sum is σ = 92746638. Its totient is φ = 68339544.

The previous prime is 79729483. The next prime is 79729547. The reversal of 79729517 is 71592797.

It can be written as a sum of positive squares in only one way, i.e., 70795396 + 8934121 = 8414^2 + 2989^2 .

It is not a de Polignac number, because 79729517 - 2²⁶ = 12620653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79729547) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 813518 + ... + 813615.

It is an arithmetic number, because the mean of its divisors is an integer number (15457773).

Almost surely, 2^79729517 is an apocalyptic number.

It is an amenable number.

79729517 is a deficient number, since it is larger than the sum of its proper divisors (13017121).

79729517 is a wasteful number, since it uses less digits than its factorization.

79729517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1627147 (or 1627140 counting only the distinct ones).

The product of its digits is 277830, while the sum is 47.

The square root of 79729517 is about 8929.1386482684. The cubic root of 79729517 is about 430.4007747167.

The spelling of 79729517 in words is "seventy-nine million, seven hundred twenty-nine thousand, five hundred seventeen".