672105217 has 24 divisors (see below), whose sum is σ = 845489664. Its totient is φ = 530635392.

The previous prime is 672105211. The next prime is 672105223. The reversal of 672105217 is 712501276.

It is an interprime number because it is at equal distance from previous prime (672105211) and next prime (672105223).

It is not a de Polignac number, because 672105217 - 2¹⁵ = 672072449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (672105211) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 30568 + ... + 47734.

It is an arithmetic number, because the mean of its divisors is an integer number (35228736).

Almost surely, 2^672105217 is an apocalyptic number.

It is an amenable number.

672105217 is a deficient number, since it is larger than the sum of its proper divisors (173384447).

672105217 is a wasteful number, since it uses less digits than its factorization.

672105217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17245 (or 17238 counting only the distinct ones).

The product of its (nonzero) digits is 5880, while the sum is 31.

The square root of 672105217 is about 25924.9921311463. The cubic root of 672105217 is about 875.9495398643.

It can be divided in two parts, 67210 and 5217, that added together give a palindrome (72427).

The spelling of 672105217 in words is "six hundred seventy-two million, one hundred five thousand, two hundred seventeen".