720564621 has 8 divisors (see below), whose sum is σ = 1098003264. Its totient is φ = 411751200.

The previous prime is 720564613. The next prime is 720564659. The reversal of 720564621 is 126465027.

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

It is not a de Polignac number, because 720564621 - 2³ = 720564613 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (720564671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17156280 + ... + 17156321.

It is an arithmetic number, because the mean of its divisors is an integer number (137250408).

Almost surely, 2^720564621 is an apocalyptic number.

It is an amenable number.

720564621 is a deficient number, since it is larger than the sum of its proper divisors (377438643).

720564621 is a wasteful number, since it uses less digits than its factorization.

720564621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34312611.

The product of its (nonzero) digits is 20160, while the sum is 33.

The square root of 720564621 is about 26843.3347593029. The cubic root of 720564621 is about 896.5151746912.

The spelling of 720564621 in words is "seven hundred twenty million, five hundred sixty-four thousand, six hundred twenty-one".