28871804 has 24 divisors (see below), whose sum is σ = 54787488. Its totient is φ = 13233600.

The previous prime is 28871789. The next prime is 28871809. The reversal of 28871804 is 40817882.

It is a happy number.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28871809) 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 7 ways as a sum of consecutive naturals, for example, 6014 + ... + 9690.

It is an arithmetic number, because the mean of its divisors is an integer number (2282812).

Almost surely, 2^28871804 is an apocalyptic number.

It is an amenable number.

28871804 is a deficient number, since it is larger than the sum of its proper divisors (25915684).

28871804 is a wasteful number, since it uses less digits than its factorization.

28871804 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3845 (or 3843 counting only the distinct ones).

The product of its (nonzero) digits is 28672, while the sum is 38.

The square root of 28871804 is about 5373.2489240682. The cubic root of 28871804 is about 306.7783026664.

The spelling of 28871804 in words is "twenty-eight million, eight hundred seventy-one thousand, eight hundred four".