28640104 has 32 divisors (see below), whose sum is σ = 57153600. Its totient is φ = 13408000.

The previous prime is 28640069. The next prime is 28640119. The reversal of 28640104 is 40104682.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33717 + ... + 34555.

It is an arithmetic number, because the mean of its divisors is an integer number (1786050).

Almost surely, 2^28640104 is an apocalyptic number.

It is an amenable number.

28640104 is a deficient number, since it is larger than the sum of its proper divisors (28513496).

28640104 is a wasteful number, since it uses less digits than its factorization.

28640104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1113 (or 1109 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 25.

The square root of 28640104 is about 5351.6449807512. The cubic root of 28640104 is about 305.9554522417.

Adding to 28640104 its reverse (40104682), we get a palindrome (68744786).

The spelling of 28640104 in words is "twenty-eight million, six hundred forty thousand, one hundred four".