720392740 has 12 divisors (see below), whose sum is σ = 1512824796. Its totient is φ = 288157088.

The previous prime is 720392723. The next prime is 720392749. The reversal of 720392740 is 47293027.

It can be written as a sum of positive squares in 2 ways, for example, as 200279104 + 520113636 = 14152^2 + 22806^2 .

It is a junction number, because it is equal to n+sod(n) for n = 720392696 and 720392705.

It is not an unprimeable number, because it can be changed into a prime (720392749) 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, 18009799 + ... + 18009838.

It is an arithmetic number, because the mean of its divisors is an integer number (126068733).

Almost surely, 2^720392740 is an apocalyptic number.

It is an amenable number.

720392740 is an abundant number, since it is smaller than the sum of its proper divisors (792432056).

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

720392740 is a wasteful number, since it uses less digits than its factorization.

720392740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36019646 (or 36019644 counting only the distinct ones).

The product of its (nonzero) digits is 21168, while the sum is 34.

The square root of 720392740 is about 26840.1330101026. The cubic root of 720392740 is about 896.4438851431.

The spelling of 720392740 in words is "seven hundred twenty million, three hundred ninety-two thousand, seven hundred forty".