28172866 has 8 divisors (see below), whose sum is σ = 42301440. Its totient is φ = 14072388.

The previous prime is 28172857. The next prime is 28172887. The reversal of 28172866 is 66827182.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4306 + ... + 8653.

It is an arithmetic number, because the mean of its divisors is an integer number (5287680).

Almost surely, 2^28172866 is an apocalyptic number.

28172866 is a deficient number, since it is larger than the sum of its proper divisors (14128574).

28172866 is a wasteful number, since it uses less digits than its factorization.

28172866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14048.

The product of its digits is 64512, while the sum is 40.

The square root of 28172866 is about 5307.8117901825. The cubic root of 28172866 is about 304.2825238842.

The spelling of 28172866 in words is "twenty-eight million, one hundred seventy-two thousand, eight hundred sixty-six".