720497764 has 36 divisors (see below), whose sum is σ = 1481887596. Its totient is φ = 305593344.

The previous prime is 720497761. The next prime is 720497783. The reversal of 720497764 is 467794027.

It can be written as a sum of positive squares in 2 ways, for example, as 116812864 + 603684900 = 10808^2 + 24570^2 .

It is not an unprimeable number, because it can be changed into a prime (720497761) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 64 + ... + 37960.

Almost surely, 2^720497764 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 720497764, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (740943798).

720497764 is an abundant number, since it is smaller than the sum of its proper divisors (761389832).

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

720497764 is a wasteful number, since it uses less digits than its factorization.

720497764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38012 (or 38003 counting only the distinct ones).

The product of its (nonzero) digits is 592704, while the sum is 46.

The square root of 720497764 is about 26842.0894119664. The cubic root of 720497764 is about 896.4874463575.

The spelling of 720497764 in words is "seven hundred twenty million, four hundred ninety-seven thousand, seven hundred sixty-four".