79677569 has 2 divisors, whose sum is σ = 79677570. Its totient is φ = 79677568.

The previous prime is 79677547. The next prime is 79677679. The reversal of 79677569 is 96577697.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 56445169 + 23232400 = 7513^2 + 4820^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-79677569 is a prime.

It is a super-2 number, since 2×79677569² = 12697030003499522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (79677509) 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, 39838784 + 39838785.

It is an arithmetic number, because the mean of its divisors is an integer number (39838785).

Almost surely, 2^79677569 is an apocalyptic number.

It is an amenable number.

79677569 is a deficient number, since it is larger than the sum of its proper divisors (1).

79677569 is an equidigital number, since it uses as much as digits as its factorization.

79677569 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5000940, while the sum is 56.

The square root of 79677569 is about 8926.2292710864. The cubic root of 79677569 is about 430.3072781132.

The spelling of 79677569 in words is "seventy-nine million, six hundred seventy-seven thousand, five hundred sixty-nine".