675639645 has 8 divisors (see below), whose sum is σ = 1081023456. Its totient is φ = 360341136.

The previous prime is 675639641. The next prime is 675639649. The reversal of 675639645 is 546936576.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (675639641) and next prime (675639649).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 675639645 - 2² = 675639641 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (675639641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22521307 + ... + 22521336.

It is an arithmetic number, because the mean of its divisors is an integer number (135127932).

Almost surely, 2^675639645 is an apocalyptic number.

It is an amenable number.

675639645 is a deficient number, since it is larger than the sum of its proper divisors (405383811).

675639645 is a wasteful number, since it uses less digits than its factorization.

675639645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45042651.

The product of its digits is 4082400, while the sum is 51.

The square root of 675639645 is about 25993.0691723775. The cubic root of 675639645 is about 877.4823204042.

The spelling of 675639645 in words is "six hundred seventy-five million, six hundred thirty-nine thousand, six hundred forty-five".