28663398 has 12 divisors (see below), whose sum is σ = 62104068. Its totient is φ = 9554460.

The previous prime is 28663367. The next prime is 28663409. The reversal of 28663398 is 89336682.

28663398 is a `hidden beast` number, since 2 + 8 + 6 + 633 + 9 + 8 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 796188 + ... + 796223.

It is an arithmetic number, because the mean of its divisors is an integer number (5175339).

Almost surely, 2^28663398 is an apocalyptic number.

28663398 is an abundant number, since it is smaller than the sum of its proper divisors (33440670).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28663398 is a wasteful number, since it uses less digits than its factorization.

28663398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1592419 (or 1592416 counting only the distinct ones).

The product of its digits is 373248, while the sum is 45.

The square root of 28663398 is about 5353.8208785876. The cubic root of 28663398 is about 306.0383778599.

The spelling of 28663398 in words is "twenty-eight million, six hundred sixty-three thousand, three hundred ninety-eight".