28688272 has 10 divisors (see below), whose sum is σ = 55583558. Its totient is φ = 14344128.

The previous prime is 28688269. The next prime is 28688273. The reversal of 28688272 is 27288682.

It can be written as a sum of positive squares in only one way, i.e., 25361296 + 3326976 = 5036^2 + 1824^2 .

It is not an unprimeable number, because it can be changed into a prime (28688273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 896493 + ... + 896524.

Almost surely, 2^28688272 is an apocalyptic number.

It is an amenable number.

28688272 is a deficient number, since it is larger than the sum of its proper divisors (26895286).

28688272 is a wasteful number, since it uses less digits than its factorization.

28688272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1793025 (or 1793019 counting only the distinct ones).

The product of its digits is 172032, while the sum is 43.

The square root of 28688272 is about 5356.1433886706. The cubic root of 28688272 is about 306.1268786216.

The spelling of 28688272 in words is "twenty-eight million, six hundred eighty-eight thousand, two hundred seventy-two".