28530906 has 8 divisors (see below), whose sum is σ = 57061824. Its totient is φ = 9510300.

The previous prime is 28530899. The next prime is 28530911. The reversal of 28530906 is 60903582.

It is a happy number.

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

28530906 is an admirable number.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

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, 2377570 + ... + 2377581.

It is an arithmetic number, because the mean of its divisors is an integer number (7132728).

Almost surely, 2^28530906 is an apocalyptic number.

28530906 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

28530906 is a wasteful number, since it uses less digits than its factorization.

28530906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4755156.

The product of its (nonzero) digits is 12960, while the sum is 33.

The square root of 28530906 is about 5341.4329538056. The cubic root of 28530906 is about 305.5661115374.

The spelling of 28530906 in words is "twenty-eight million, five hundred thirty thousand, nine hundred six".