672517221 has 16 divisors (see below), whose sum is σ = 932342400. Its totient is φ = 430676288.

The previous prime is 672517201. The next prime is 672517277. The reversal of 672517221 is 122715276.

It is a cyclic number.

It is not a de Polignac number, because 672517221 - 2¹⁰ = 672516197 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (672517201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2481 + ... + 36758.

It is an arithmetic number, because the mean of its divisors is an integer number (58271400).

Almost surely, 2^672517221 is an apocalyptic number.

It is an amenable number.

672517221 is a deficient number, since it is larger than the sum of its proper divisors (259825179).

672517221 is a wasteful number, since it uses less digits than its factorization.

672517221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39468.

The product of its digits is 11760, while the sum is 33.

The square root of 672517221 is about 25932.9369914015. The cubic root of 672517221 is about 876.1284905140.

The spelling of 672517221 in words is "six hundred seventy-two million, five hundred seventeen thousand, two hundred twenty-one".