28251806 has 16 divisors (see below), whose sum is σ = 46616688. Its totient is φ = 12840520.

The previous prime is 28251799. The next prime is 28251827. The reversal of 28251806 is 60815282.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2645 + ... + 7968.

It is an arithmetic number, because the mean of its divisors is an integer number (2913543).

Almost surely, 2^28251806 is an apocalyptic number.

28251806 is a deficient number, since it is larger than the sum of its proper divisors (18364882).

28251806 is a wasteful number, since it uses less digits than its factorization.

28251806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10648 (or 10626 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 32.

The square root of 28251806 is about 5315.2427978409. The cubic root of 28251806 is about 304.5664573997.

The spelling of 28251806 in words is "twenty-eight million, two hundred fifty-one thousand, eight hundred six".