7280724 has 48 divisors (see below), whose sum is σ = 19514880. Its totient is φ = 2089440.

The previous prime is 7280701. The next prime is 7280731. The reversal of 7280724 is 4270827.

It is a junction number, because it is equal to n+sod(n) for n = 7280691 and 7280700.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1057 + ... + 3959.

It is an arithmetic number, because the mean of its divisors is an integer number (406560).

Almost surely, 2^7280724 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 7280724, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9757440).

7280724 is an abundant number, since it is smaller than the sum of its proper divisors (12234156).

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

7280724 is a wasteful number, since it uses less digits than its factorization.

7280724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2940 (or 2938 counting only the distinct ones).

The product of its (nonzero) digits is 6272, while the sum is 30.

The square root of 7280724 is about 2698.2816754372. The cubic root of 7280724 is about 193.8168463067.

The spelling of 7280724 in words is "seven million, two hundred eighty thousand, seven hundred twenty-four".