28809868 has 6 divisors (see below), whose sum is σ = 50417276. Its totient is φ = 14404932.

The previous prime is 28809841. The next prime is 28809887. The reversal of 28809868 is 86890882.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3601230 + ... + 3601237.

Almost surely, 2^28809868 is an apocalyptic number.

It is an amenable number.

28809868 is a deficient number, since it is larger than the sum of its proper divisors (21607408).

28809868 is a wasteful number, since it uses less digits than its factorization.

28809868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7202471 (or 7202469 counting only the distinct ones).

The product of its (nonzero) digits is 442368, while the sum is 49.

The square root of 28809868 is about 5367.4824638745. The cubic root of 28809868 is about 306.5587779480.

The spelling of 28809868 in words is "twenty-eight million, eight hundred nine thousand, eight hundred sixty-eight".