720783280 has 80 divisors (see below), whose sum is σ = 1961999424. Its totient is φ = 241090560.

The previous prime is 720783277. The next prime is 720783299. The reversal of 720783280 is 82387027.

It is a tau number, because it is divible by the number of its divisors (80).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7264 + ... + 38656.

Almost surely, 2^720783280 is an apocalyptic number.

720783280 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 720783280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (980999712).

720783280 is an abundant number, since it is smaller than the sum of its proper divisors (1241216144).

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

720783280 is a wasteful number, since it uses less digits than its factorization.

720783280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31454 (or 31448 counting only the distinct ones).

The product of its (nonzero) digits is 37632, while the sum is 37.

The square root of 720783280 is about 26847.4073236132. The cubic root of 720783280 is about 896.6058495501.

The spelling of 720783280 in words is "seven hundred twenty million, seven hundred eighty-three thousand, two hundred eighty".