79646729 has 2 divisors, whose sum is σ = 79646730. Its totient is φ = 79646728.

The previous prime is 79646659. The next prime is 79646747. The reversal of 79646729 is 92764697.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 73496329 + 6150400 = 8573^2 + 2480^2 .

It is a cyclic number.

It is not a de Polignac number, because 79646729 - 2⁸ = 79646473 is a prime.

It is not a weakly prime, because it can be changed into another prime (79646779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39823364 + 39823365.

It is an arithmetic number, because the mean of its divisors is an integer number (39823365).

Almost surely, 2^79646729 is an apocalyptic number.

It is an amenable number.

79646729 is a deficient number, since it is larger than the sum of its proper divisors (1).

79646729 is an equidigital number, since it uses as much as digits as its factorization.

79646729 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1143072, while the sum is 50.

The square root of 79646729 is about 8924.5016107343. The cubic root of 79646729 is about 430.2517527034.

The spelling of 79646729 in words is "seventy-nine million, six hundred forty-six thousand, seven hundred twenty-nine".