79828669 has 2 divisors, whose sum is σ = 79828670. Its totient is φ = 79828668.

The previous prime is 79828643. The next prime is 79828733. The reversal of 79828669 is 96682897.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 52736644 + 27092025 = 7262^2 + 5205^2 .

It is a cyclic number.

It is not a de Polignac number, because 79828669 - 2²¹ = 77731517 is a prime.

It is a super-2 number, since 2×79828669² = 12745232788623122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79828169) 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 as a sum of consecutive naturals, namely, 39914334 + 39914335.

It is an arithmetic number, because the mean of its divisors is an integer number (39914335).

Almost surely, 2^79828669 is an apocalyptic number.

It is an amenable number.

79828669 is a deficient number, since it is larger than the sum of its proper divisors (1).

79828669 is an equidigital number, since it uses as much as digits as its factorization.

79828669 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2612736, while the sum is 55.

The square root of 79828669 is about 8934.6890824471. The cubic root of 79828669 is about 430.5791169464.

The spelling of 79828669 in words is "seventy-nine million, eight hundred twenty-eight thousand, six hundred sixty-nine".