28004132 has 24 divisors (see below), whose sum is σ = 53192832. Its totient is φ = 12823200.

The previous prime is 28004099. The next prime is 28004143. The reversal of 28004132 is 23140082.

It is a Smith number, since the sum of its digits (20) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

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, 4757 + ... + 8867.

It is an arithmetic number, because the mean of its divisors is an integer number (2216368).

Almost surely, 2^28004132 is an apocalyptic number.

It is an amenable number.

28004132 is a deficient number, since it is larger than the sum of its proper divisors (25188700).

28004132 is a wasteful number, since it uses less digits than its factorization.

28004132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4259 (or 4257 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 28004132 is about 5291.8930450265. The cubic root of 28004132 is about 303.6738335786.

The spelling of 28004132 in words is "twenty-eight million, four thousand, one hundred thirty-two".