28404886 has 8 divisors (see below), whose sum is σ = 44849880. Its totient is φ = 13454928.

The previous prime is 28404881. The next prime is 28404919. The reversal of 28404886 is 68840482.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28404881) 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 3 ways as a sum of consecutive naturals, for example, 373711 + ... + 373786.

It is an arithmetic number, because the mean of its divisors is an integer number (5606235).

Almost surely, 2^28404886 is an apocalyptic number.

28404886 is a deficient number, since it is larger than the sum of its proper divisors (16444994).

28404886 is a wasteful number, since it uses less digits than its factorization.

28404886 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 747518.

The product of its (nonzero) digits is 98304, while the sum is 40.

The square root of 28404886 is about 5329.6234388557. The cubic root of 28404886 is about 305.1155559627.

The spelling of 28404886 in words is "twenty-eight million, four hundred four thousand, eight hundred eighty-six".