7280720 has 20 divisors (see below), whose sum is σ = 16927860. Its totient is φ = 2912256.

The previous prime is 7280701. The next prime is 7280731. The reversal of 7280720 is 270827.

It can be written as a sum of positive squares in 2 ways, for example, as 2155024 + 5125696 = 1468^2 + 2264^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a hoax number, since the sum of its digits (26) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 7280720.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45425 + ... + 45584.

It is an arithmetic number, because the mean of its divisors is an integer number (846393).

Almost surely, 2^7280720 is an apocalyptic number.

It is an amenable number.

7280720 is an abundant number, since it is smaller than the sum of its proper divisors (9647140).

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

7280720 is a wasteful number, since it uses less digits than its factorization.

7280720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91022 (or 91016 counting only the distinct ones).

The product of its (nonzero) digits is 1568, while the sum is 26.

The square root of 7280720 is about 2698.2809342246. The cubic root of 7280720 is about 193.8168108126.

It can be divided in two parts, 72807 and 20, that added together give a palindrome (72827).

The spelling of 7280720 in words is "seven million, two hundred eighty thousand, seven hundred twenty".