720620720 has 20 divisors (see below), whose sum is σ = 1675443360. Its totient is φ = 288248256.

The previous prime is 720620717. The next prime is 720620743. The reversal of 720620720 is 27026027.

It is a tau number, because it is divible by the number of its divisors (20).

It is a self number, because there is not a number n which added to its sum of digits gives 720620720.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4503800 + ... + 4503959.

It is an arithmetic number, because the mean of its divisors is an integer number (83772168).

Almost surely, 2^720620720 is an apocalyptic number.

It is an amenable number.

720620720 is an abundant number, since it is smaller than the sum of its proper divisors (954822640).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

720620720 is a wasteful number, since it uses less digits than its factorization.

720620720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9007772 (or 9007766 counting only the distinct ones).

The product of its (nonzero) digits is 2352, while the sum is 26.

The square root of 720620720 is about 26844.3796724752. The cubic root of 720620720 is about 896.5384399188.

Adding to 720620720 its reverse (27026027), we get a palindrome (747646747).

The spelling of 720620720 in words is "seven hundred twenty million, six hundred twenty thousand, seven hundred twenty".