672747665 has 8 divisors (see below), whose sum is σ = 812716200. Its totient is φ = 534585472.

The previous prime is 672747661. The next prime is 672747667. The reversal of 672747665 is 566747276.

It can be written as a sum of positive squares in 4 ways, for example, as 93238336 + 579509329 = 9656^2 + 24073^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 672747665 - 2² = 672747661 is a prime.

It is not an unprimeable number, because it can be changed into a prime (672747661) 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, 450764 + ... + 452253.

It is an arithmetic number, because the mean of its divisors is an integer number (101589525).

Almost surely, 2^672747665 is an apocalyptic number.

It is an amenable number.

672747665 is a deficient number, since it is larger than the sum of its proper divisors (139968535).

672747665 is a wasteful number, since it uses less digits than its factorization.

672747665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 903171.

The product of its digits is 2963520, while the sum is 50.

The square root of 672747665 is about 25937.3796864679. The cubic root of 672747665 is about 876.2285501562.

The spelling of 672747665 in words is "six hundred seventy-two million, seven hundred forty-seven thousand, six hundred sixty-five".