28259566 has 4 divisors (see below), whose sum is σ = 42389352. Its totient is φ = 14129782.

The previous prime is 28259533. The next prime is 28259579. The reversal of 28259566 is 66595282.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7064890 + ... + 7064893.

It is an arithmetic number, because the mean of its divisors is an integer number (10597338).

Almost surely, 2^28259566 is an apocalyptic number.

28259566 is a deficient number, since it is larger than the sum of its proper divisors (14129786).

28259566 is a wasteful number, since it uses less digits than its factorization.

28259566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14129785.

The product of its digits is 259200, while the sum is 43.

The square root of 28259566 is about 5315.9727237825. The cubic root of 28259566 is about 304.5943402113.

The spelling of 28259566 in words is "twenty-eight million, two hundred fifty-nine thousand, five hundred sixty-six".