79129665 has 12 divisors (see below), whose sum is σ = 137158164. Its totient is φ = 42202464.

The previous prime is 79129657. The next prime is 79129667. The reversal of 79129665 is 56692197.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 26378496 + 52751169 = 5136^2 + 7263^2 .

It is not a de Polignac number, because 79129665 - 2³ = 79129657 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 1758437 = 79129665 / (7 + 9 + 1 + 2 + 9 + 6 + 6 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 79129665.

It is not an unprimeable number, because it can be changed into a prime (79129667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 879174 + ... + 879263.

It is an arithmetic number, because the mean of its divisors is an integer number (11429847).

Almost surely, 2^79129665 is an apocalyptic number.

It is an amenable number.

79129665 is a deficient number, since it is larger than the sum of its proper divisors (58028499).

79129665 is a wasteful number, since it uses less digits than its factorization.

79129665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1758448 (or 1758445 counting only the distinct ones).

The product of its digits is 204120, while the sum is 45.

The square root of 79129665 is about 8895.4856528466. The cubic root of 79129665 is about 429.3186704262.

The spelling of 79129665 in words is "seventy-nine million, one hundred twenty-nine thousand, six hundred sixty-five".