28404863 has 8 divisors (see below), whose sum is σ = 29353632. Its totient is φ = 27465696.

The previous prime is 28404853. The next prime is 28404881. The reversal of 28404863 is 36840482.

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 28404863 - 2¹² = 28400767 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 (28404853) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3881 + ... + 8477.

It is an arithmetic number, because the mean of its divisors is an integer number (3669204).

Almost surely, 2^28404863 is an apocalyptic number.

28404863 is a deficient number, since it is larger than the sum of its proper divisors (948769).

28404863 is a wasteful number, since it uses less digits than its factorization.

28404863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4801.

The product of its (nonzero) digits is 36864, while the sum is 35.

The square root of 28404863 is about 5329.6212811043. The cubic root of 28404863 is about 305.1154736100.

The spelling of 28404863 in words is "twenty-eight million, four hundred four thousand, eight hundred sixty-three".