679566449 has 6 divisors (see below), whose sum is σ = 721892694. Its totient is φ = 639591680.

The previous prime is 679566427. The next prime is 679566473. The reversal of 679566449 is 944665976.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 118113424 + 561453025 = 10868^2 + 23695^2 .

It is a de Polignac number, because none of the positive numbers 2^k-679566449 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 679566394 and 679566403.

It is not an unprimeable number, because it can be changed into a prime (679566479) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1175432 + ... + 1176009.

It is an arithmetic number, because the mean of its divisors is an integer number (120315449).

Almost surely, 2^679566449 is an apocalyptic number.

It is an amenable number.

679566449 is a deficient number, since it is larger than the sum of its proper divisors (42326245).

679566449 is a wasteful number, since it uses less digits than its factorization.

679566449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2351475 (or 2351458 counting only the distinct ones).

The product of its digits is 9797760, while the sum is 56.

The square root of 679566449 is about 26068.4953344070. The cubic root of 679566449 is about 879.1790074541.

The spelling of 679566449 in words is "six hundred seventy-nine million, five hundred sixty-six thousand, four hundred forty-nine".