18275728 has 10 divisors (see below), whose sum is σ = 35409254. Its totient is φ = 9137856.

The previous prime is 18275717. The next prime is 18275729. The reversal of 18275728 is 82757281.

It can be written as a sum of positive squares in only one way, i.e., 14992384 + 3283344 = 3872^2 + 1812^2 .

It is not an unprimeable number, because it can be changed into a prime (18275729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 571101 + ... + 571132.

Almost surely, 2^18275728 is an apocalyptic number.

It is an amenable number.

18275728 is a deficient number, since it is larger than the sum of its proper divisors (17133526).

18275728 is a wasteful number, since it uses less digits than its factorization.

18275728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1142241 (or 1142235 counting only the distinct ones).

The product of its digits is 62720, while the sum is 40.

The square root of 18275728 is about 4275.0120467667. The cubic root of 18275728 is about 263.4055341554.

The spelling of 18275728 in words is "eighteen million, two hundred seventy-five thousand, seven hundred twenty-eight".