28403568 has 80 divisors (see below), whose sum is σ = 83779360. Its totient is φ = 9206784.

The previous prime is 28403561. The next prime is 28403623. The reversal of 28403568 is 86530482.

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 (28403561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15096 + ... + 16872.

It is an arithmetic number, because the mean of its divisors is an integer number (1047242).

Almost surely, 2^28403568 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 28403568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41889680).

28403568 is an abundant number, since it is smaller than the sum of its proper divisors (55375792).

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

28403568 is a wasteful number, since it uses less digits than its factorization.

28403568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1831 (or 1819 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 36.

The square root of 28403568 is about 5329.4997889108. The cubic root of 28403568 is about 305.1108367215.

The spelling of 28403568 in words is "twenty-eight million, four hundred three thousand, five hundred sixty-eight".