79685729 has 2 divisors, whose sum is σ = 79685730. Its totient is φ = 79685728.

The previous prime is 79685701. The next prime is 79685737. The reversal of 79685729 is 92758697.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40960000 + 38725729 = 6400^2 + 6223^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-79685729 is a prime.

It is a super-2 number, since 2×79685729² = 12699630812522882, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (79685029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39842864 + 39842865.

It is an arithmetic number, because the mean of its divisors is an integer number (39842865).

Almost surely, 2^79685729 is an apocalyptic number.

It is an amenable number.

79685729 is a deficient number, since it is larger than the sum of its proper divisors (1).

79685729 is an equidigital number, since it uses as much as digits as its factorization.

79685729 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1905120, while the sum is 53.

The square root of 79685729 is about 8926.6863392863. The cubic root of 79685729 is about 430.3219672642.

The spelling of 79685729 in words is "seventy-nine million, six hundred eighty-five thousand, seven hundred twenty-nine".