28671804 has 36 divisors (see below), whose sum is σ = 82830384. Its totient is φ = 8191872.

The previous prime is 28671803. The next prime is 28671821. The reversal of 28671804 is 40817682.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×28671804² = 1644144689228832, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28671803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 56637 + ... + 57140.

It is an arithmetic number, because the mean of its divisors is an integer number (2300844).

Almost surely, 2^28671804 is an apocalyptic number.

It is an amenable number.

28671804 is an abundant number, since it is smaller than the sum of its proper divisors (54158580).

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

28671804 is a wasteful number, since it uses less digits than its factorization.

28671804 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113794 (or 113789 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 36.

The square root of 28671804 is about 5354.6058678487. The cubic root of 28671804 is about 306.0682918192.

The spelling of 28671804 in words is "twenty-eight million, six hundred seventy-one thousand, eight hundred four".