720650221 has 24 divisors (see below), whose sum is σ = 788298144. Its totient is φ = 658199520.

The previous prime is 720650171. The next prime is 720650263. The reversal of 720650221 is 122056027.

It is not a de Polignac number, because 720650221 - 2²⁵ = 687095789 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (720650291) 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, 2177026 + ... + 2177356.

It is an arithmetic number, because the mean of its divisors is an integer number (32845756).

Almost surely, 2^720650221 is an apocalyptic number.

It is an amenable number.

720650221 is a deficient number, since it is larger than the sum of its proper divisors (67647923).

720650221 is a wasteful number, since it uses less digits than its factorization.

720650221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 569 (or 550 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 720650221 is about 26844.9291487238. The cubic root of 720650221 is about 896.5506740103.

The spelling of 720650221 in words is "seven hundred twenty million, six hundred fifty thousand, two hundred twenty-one".