7125728 has 12 divisors (see below), whose sum is σ = 14028840. Its totient is φ = 3562848.

The previous prime is 7125707. The next prime is 7125731. The reversal of 7125728 is 8275217.

It is a Harshad number since it is a multiple of its sum of digits (32), and also a Moran number because the ratio is a prime number: 222679 = 7125728 / (7 + 1 + 2 + 5 + 7 + 2 + 8).

It is a junction number, because it is equal to n+sod(n) for n = 7125694 and 7125703.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111308 + ... + 111371.

It is an arithmetic number, because the mean of its divisors is an integer number (1169070).

Almost surely, 2^7125728 is an apocalyptic number.

It is an amenable number.

7125728 is a deficient number, since it is larger than the sum of its proper divisors (6903112).

7125728 is a wasteful number, since it uses less digits than its factorization.

7125728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222689 (or 222681 counting only the distinct ones).

The product of its digits is 7840, while the sum is 32.

The square root of 7125728 is about 2669.4059264188. The cubic root of 7125728 is about 192.4316100455.

The spelling of 7125728 in words is "seven million, one hundred twenty-five thousand, seven hundred twenty-eight".