672844517 has 2 divisors, whose sum is σ = 672844518. Its totient is φ = 672844516.

The previous prime is 672844499. The next prime is 672844541. The reversal of 672844517 is 715448276.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 632572801 + 40271716 = 25151^2 + 6346^2 .

It is a cyclic number.

It is not a de Polignac number, because 672844517 - 2⁸ = 672844261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (672844567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 336422258 + 336422259.

It is an arithmetic number, because the mean of its divisors is an integer number (336422259).

Almost surely, 2^672844517 is an apocalyptic number.

It is an amenable number.

672844517 is a deficient number, since it is larger than the sum of its proper divisors (1).

672844517 is an equidigital number, since it uses as much as digits as its factorization.

672844517 is an evil number, because the sum of its binary digits is even.

The product of its digits is 376320, while the sum is 44.

The square root of 672844517 is about 25939.2466544424. The cubic root of 672844517 is about 876.2705968352.

The spelling of 672844517 in words is "six hundred seventy-two million, eight hundred forty-four thousand, five hundred seventeen".