720399280 has 20 divisors (see below), whose sum is σ = 1674928512. Its totient is φ = 288159680.

The previous prime is 720399257. The next prime is 720399289. The reversal of 720399280 is 82993027.

720399280 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a Harshad number since it is a multiple of its sum of digits (40).

It is not an unprimeable number, because it can be changed into a prime (720399289) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4502416 + ... + 4502575.

Almost surely, 2^720399280 is an apocalyptic number.

It is an amenable number.

720399280 is an abundant number, since it is smaller than the sum of its proper divisors (954529232).

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

720399280 is a wasteful number, since it uses less digits than its factorization.

720399280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9005004 (or 9004998 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 40.

The square root of 720399280 is about 26840.2548423073. The cubic root of 720399280 is about 896.4465978880.

The spelling of 720399280 in words is "seven hundred twenty million, three hundred ninety-nine thousand, two hundred eighty".