28204668 has 72 divisors (see below), whose sum is σ = 74547200. Its totient is φ = 8981280.

The previous prime is 28204667. The next prime is 28204681. The reversal of 28204668 is 86640282.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28204661) 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, 141633 + ... + 141831.

Almost surely, 2^28204668 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28204668, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37273600).

28204668 is an abundant number, since it is smaller than the sum of its proper divisors (46342532).

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

28204668 is a wasteful number, since it uses less digits than its factorization.

28204668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 367 (or 362 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 36.

The square root of 28204668 is about 5310.8067183809. The cubic root of 28204668 is about 304.3969738896.

The spelling of 28204668 in words is "twenty-eight million, two hundred four thousand, six hundred sixty-eight".