28561408 has 52 divisors (see below), whose sum is σ = 60285760. Its totient is φ = 13492224.

The previous prime is 28561399. The next prime is 28561409. The reversal of 28561408 is 80416582.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28561409) 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, 77641 + ... + 78007.

Almost surely, 2^28561408 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 28561408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30142880).

28561408 is an abundant number, since it is smaller than the sum of its proper divisors (31724352).

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

28561408 is an equidigital number, since it uses as much as digits as its factorization.

28561408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 410 (or 388 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 34.

The square root of 28561408 is about 5344.2874174206. The cubic root of 28561408 is about 305.6749649339.

The spelling of 28561408 in words is "twenty-eight million, five hundred sixty-one thousand, four hundred eight".