28006904 has 8 divisors (see below), whose sum is σ = 52512960. Its totient is φ = 14003448.

The previous prime is 28006897. The next prime is 28006967. The reversal of 28006904 is 40960082.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1750424 + ... + 1750439.

It is an arithmetic number, because the mean of its divisors is an integer number (6564120).

Almost surely, 2^28006904 is an apocalyptic number.

It is an amenable number.

28006904 is a deficient number, since it is larger than the sum of its proper divisors (24506056).

28006904 is a wasteful number, since it uses less digits than its factorization.

28006904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3500869 (or 3500865 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 28006904 is about 5292.1549486008. The cubic root of 28006904 is about 303.6838530059.

Adding to 28006904 its reverse (40960082), we get a palindrome (68966986).

The spelling of 28006904 in words is "twenty-eight million, six thousand, nine hundred four".