720639120 has 40 divisors (see below), whose sum is σ = 2233982016. Its totient is φ = 192170368.

The previous prime is 720639119. The next prime is 720639149. The reversal of 720639120 is 21936027.

It is a tau number, because it is divible by the number of its divisors (40).

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1501092 + ... + 1501571.

Almost surely, 2^720639120 is an apocalyptic number.

It is an amenable number.

720639120 is an abundant number, since it is smaller than the sum of its proper divisors (1513342896).

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

720639120 is a wasteful number, since it uses less digits than its factorization.

720639120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3002679 (or 3002673 counting only the distinct ones).

The product of its (nonzero) digits is 4536, while the sum is 30.

The square root of 720639120 is about 26844.7223863463. The cubic root of 720639120 is about 896.5460704547.

The spelling of 720639120 in words is "seven hundred twenty million, six hundred thirty-nine thousand, one hundred twenty".