672949609 has 2 divisors, whose sum is σ = 672949610. Its totient is φ = 672949608.

The previous prime is 672949601. The next prime is 672949633. The reversal of 672949609 is 906949276.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 405136384 + 267813225 = 20128^2 + 16365^2 .

It is a cyclic number.

It is not a de Polignac number, because 672949609 - 2³ = 672949601 is a prime.

It is a super-2 number, since 2×672949609² = 905722352506505762, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (672949601) 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, 336474804 + 336474805.

It is an arithmetic number, because the mean of its divisors is an integer number (336474805).

Almost surely, 2^672949609 is an apocalyptic number.

It is an amenable number.

672949609 is a deficient number, since it is larger than the sum of its proper divisors (1).

672949609 is an equidigital number, since it uses as much as digits as its factorization.

672949609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1469664, while the sum is 52.

The square root of 672949609 is about 25941.2723088132. The cubic root of 672949609 is about 876.3162162085.

The spelling of 672949609 in words is "six hundred seventy-two million, nine hundred forty-nine thousand, six hundred nine".