28004087 has 8 divisors (see below), whose sum is σ = 29774304. Its totient is φ = 26279968.

The previous prime is 28004069. The next prime is 28004089. The reversal of 28004087 is 78040082.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28004087 - 2⁶ = 28004023 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28004089) 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 7 ways as a sum of consecutive naturals, for example, 10268 + ... + 12705.

It is an arithmetic number, because the mean of its divisors is an integer number (3721788).

Almost surely, 2^28004087 is an apocalyptic number.

28004087 is a deficient number, since it is larger than the sum of its proper divisors (1770217).

28004087 is a wasteful number, since it uses less digits than its factorization.

28004087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23049.

The product of its (nonzero) digits is 3584, while the sum is 29.

The square root of 28004087 is about 5291.8887932382. Note that the first 3 decimals coincide. The cubic root of 28004087 is about 303.6736709201.

The spelling of 28004087 in words is "twenty-eight million, four thousand, eighty-seven".