674743649 has 2 divisors, whose sum is σ = 674743650. Its totient is φ = 674743648.

The previous prime is 674743579. The next prime is 674743711. The reversal of 674743649 is 946347476.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 449143249 + 225600400 = 21193^2 + 15020^2 .

It is a cyclic number.

It is not a de Polignac number, because 674743649 - 2²⁸ = 406308193 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 674743597 and 674743606.

It is not a weakly prime, because it can be changed into another prime (674745649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 337371824 + 337371825.

It is an arithmetic number, because the mean of its divisors is an integer number (337371825).

Almost surely, 2^674743649 is an apocalyptic number.

It is an amenable number.

674743649 is a deficient number, since it is larger than the sum of its proper divisors (1).

674743649 is an equidigital number, since it uses as much as digits as its factorization.

674743649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3048192, while the sum is 50.

The square root of 674743649 is about 25975.8281677409. The cubic root of 674743649 is about 877.0942592739.

The spelling of 674743649 in words is "six hundred seventy-four million, seven hundred forty-three thousand, six hundred forty-nine".