28002904 has 16 divisors (see below), whose sum is σ = 53367120. Its totient is φ = 13771680.

The previous prime is 28002901. The next prime is 28002907. The reversal of 28002904 is 40920082.

It is an interprime number because it is at equal distance from previous prime (28002901) and next prime (28002907).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28002901) 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, 28204 + ... + 29179.

It is an arithmetic number, because the mean of its divisors is an integer number (3335445).

Almost surely, 2^28002904 is an apocalyptic number.

It is an amenable number.

28002904 is a deficient number, since it is larger than the sum of its proper divisors (25364216).

28002904 is a wasteful number, since it uses less digits than its factorization.

28002904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57450 (or 57446 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 28002904 is about 5291.7770172221. Note that the first 3 decimals coincide. The cubic root of 28002904 is about 303.6693947465.

Adding to 28002904 its reverse (40920082), we get a palindrome (68922986).

The spelling of 28002904 in words is "twenty-eight million, two thousand, nine hundred four".