28564650 has 72 divisors (see below), whose sum is σ = 79619904. Its totient is φ = 7614000.

The previous prime is 28564621. The next prime is 28564687. The reversal of 28564650 is 5646582.

28564650 is a `hidden beast` number, since 2 + 8 + 5 + 646 + 5 + 0 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 10975 + ... + 13325.

It is an arithmetic number, because the mean of its divisors is an integer number (1105832).

Almost surely, 2^28564650 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28564650, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39809952).

28564650 is an abundant number, since it is smaller than the sum of its proper divisors (51055254).

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

28564650 is a wasteful number, since it uses less digits than its factorization.

28564650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2378 (or 2361 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 36.

The square root of 28564650 is about 5344.5907233389. The cubic root of 28564650 is about 305.6865301988.

The spelling of 28564650 in words is "twenty-eight million, five hundred sixty-four thousand, six hundred fifty".