28661022 has 48 divisors (see below), whose sum is σ = 68167008. Its totient is φ = 8648640.

The previous prime is 28661021. The next prime is 28661027. The reversal of 28661022 is 22016682.

28661022 is a `hidden beast` number, since 28 + 6 + 610 + 22 = 666.

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28661021) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11247 + ... + 13557.

It is an arithmetic number, because the mean of its divisors is an integer number (1420146).

Almost surely, 2^28661022 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28661022, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34083504).

28661022 is an abundant number, since it is smaller than the sum of its proper divisors (39505986).

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

28661022 is a wasteful number, since it uses less digits than its factorization.

28661022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2385 (or 2382 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 28661022 is about 5353.5989763896. The cubic root of 28661022 is about 306.0299214622.

The spelling of 28661022 in words is "twenty-eight million, six hundred sixty-one thousand, twenty-two".