28561906 has 8 divisors (see below), whose sum is σ = 44705664. Its totient is φ = 13660020.

The previous prime is 28561901. The next prime is 28561909. The reversal of 28561906 is 60916582.

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

It is not an unprimeable number, because it can be changed into a prime (28561901) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 310410 + ... + 310501.

It is an arithmetic number, because the mean of its divisors is an integer number (5588208).

Almost surely, 2^28561906 is an apocalyptic number.

28561906 is a deficient number, since it is larger than the sum of its proper divisors (16143758).

28561906 is a wasteful number, since it uses less digits than its factorization.

28561906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 620936.

The product of its (nonzero) digits is 25920, while the sum is 37.

The square root of 28561906 is about 5344.3340090230. The cubic root of 28561906 is about 305.6767415183.

The spelling of 28561906 in words is "twenty-eight million, five hundred sixty-one thousand, nine hundred six".