28063904 has 48 divisors (see below), whose sum is σ = 61308576. Its totient is φ = 12537600.

The previous prime is 28063891. The next prime is 28063939. The reversal of 28063904 is 40936082.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20819 + ... + 22125.

It is an arithmetic number, because the mean of its divisors is an integer number (1277262).

Almost surely, 2^28063904 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 28063904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30654288).

28063904 is an abundant number, since it is smaller than the sum of its proper divisors (33244672).

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

28063904 is a wasteful number, since it uses less digits than its factorization.

28063904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1389 (or 1381 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 28063904 is about 5297.5375411600. The cubic root of 28063904 is about 303.8897337859.

Adding to 28063904 its reverse (40936082), we get a palindrome (68999986).

The spelling of 28063904 in words is "twenty-eight million, sixty-three thousand, nine hundred four".