720797660 has 48 divisors (see below), whose sum is σ = 1655186400. Its totient is φ = 261488640.

The previous prime is 720797657. The next prime is 720797663. The reversal of 720797660 is 66797027.

It is an interprime number because it is at equal distance from previous prime (720797657) and next prime (720797663).

It is a super-2 number, since 2×720797660² = 1039098533322951200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (720797663) 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, 95132 + ... + 102428.

It is an arithmetic number, because the mean of its divisors is an integer number (34483050).

Almost surely, 2^720797660 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 720797660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (827593200).

720797660 is an abundant number, since it is smaller than the sum of its proper divisors (934388740).

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

720797660 is a wasteful number, since it uses less digits than its factorization.

720797660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7766 (or 7764 counting only the distinct ones).

The product of its (nonzero) digits is 222264, while the sum is 44.

The square root of 720797660 is about 26847.6751321227. The cubic root of 720797660 is about 896.6118120943.

The spelling of 720797660 in words is "seven hundred twenty million, seven hundred ninety-seven thousand, six hundred sixty".