647675449 has 4 divisors (see below), whose sum is σ = 648343440. Its totient is φ = 647007460.

The previous prime is 647675443. The next prime is 647675453. The reversal of 647675449 is 944576746.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 647675449 - 2⁷ = 647675321 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 647675396 and 647675405.

It is not an unprimeable number, because it can be changed into a prime (647675443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 332539 + ... + 334480.

It is an arithmetic number, because the mean of its divisors is an integer number (162085860).

Almost surely, 2^647675449 is an apocalyptic number.

It is an amenable number.

647675449 is a deficient number, since it is larger than the sum of its proper divisors (667991).

647675449 is an equidigital number, since it uses as much as digits as its factorization.

647675449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 667990.

The product of its digits is 5080320, while the sum is 52.

The square root of 647675449 is about 25449.4685406199. The cubic root of 647675449 is about 865.2052478299.

The spelling of 647675449 in words is "six hundred forty-seven million, six hundred seventy-five thousand, four hundred forty-nine".