720538280 has 64 divisors (see below), whose sum is σ = 2021258880. Its totient is φ = 224582400.

The previous prime is 720538279. The next prime is 720538297. The reversal of 720538280 is 82835027.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a self number, because there is not a number n which added to its sum of digits gives 720538280.

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, 113891 + ... + 120050.

It is an arithmetic number, because the mean of its divisors is an integer number (31582170).

Almost surely, 2^720538280 is an apocalyptic number.

720538280 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

720538280 is an abundant number, since it is smaller than the sum of its proper divisors (1300720600).

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

720538280 is a wasteful number, since it uses less digits than its factorization.

720538280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 233970 (or 233966 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 35.

The square root of 720538280 is about 26842.8441116064. The cubic root of 720538280 is about 896.5042502054.

The spelling of 720538280 in words is "seven hundred twenty million, five hundred thirty-eight thousand, two hundred eighty".