720651720 has 64 divisors (see below), whose sum is σ = 2164878720. Its totient is φ = 191913984.

The previous prime is 720651719. The next prime is 720651727. The reversal of 720651720 is 27156027.

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

It is not an unprimeable number, because it can be changed into a prime (720651727) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 95112 + ... + 102408.

It is an arithmetic number, because the mean of its divisors is an integer number (33826230).

Almost surely, 2^720651720 is an apocalyptic number.

It is an amenable number.

720651720 is an abundant number, since it is smaller than the sum of its proper divisors (1444227000).

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

720651720 is a wasteful number, since it uses less digits than its factorization.

720651720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8134 (or 8130 counting only the distinct ones).

The product of its (nonzero) digits is 5880, while the sum is 30.

The square root of 720651720 is about 26844.9570683210. The cubic root of 720651720 is about 896.5512956381.

The spelling of 720651720 in words is "seven hundred twenty million, six hundred fifty-one thousand, seven hundred twenty".