7280725 has 12 divisors (see below), whose sum is σ = 9083620. Its totient is φ = 5788800.

The previous prime is 7280701. The next prime is 7280731. The reversal of 7280725 is 5270827.

It can be written as a sum of positive squares in 6 ways, for example, as 194481 + 7086244 = 441^2 + 2662^2 .

It is a de Polignac number, because none of the positive numbers 2^k-7280725 is a prime.

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3721 + ... + 5329.

Almost surely, 2^7280725 is an apocalyptic number.

It is an amenable number.

7280725 is a deficient number, since it is larger than the sum of its proper divisors (1802895).

7280725 is a wasteful number, since it uses less digits than its factorization.

7280725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1800 (or 1795 counting only the distinct ones).

The product of its (nonzero) digits is 7840, while the sum is 31.

The square root of 7280725 is about 2698.2818607403. The cubic root of 7280725 is about 193.8168551802.

The spelling of 7280725 in words is "seven million, two hundred eighty thousand, seven hundred twenty-five".