28436838 has 8 divisors (see below), whose sum is σ = 56873688. Its totient is φ = 9478944.

The previous prime is 28436819. The next prime is 28436861. The reversal of 28436838 is 83863482.

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

28436838 is an admirable number.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 28436838.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2369731 + ... + 2369742.

It is an arithmetic number, because the mean of its divisors is an integer number (7109211).

Almost surely, 2^28436838 is an apocalyptic number.

28436838 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

28436838 is a wasteful number, since it uses less digits than its factorization.

28436838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4739478.

The product of its digits is 221184, while the sum is 42.

The square root of 28436838 is about 5332.6201814868. The cubic root of 28436838 is about 305.2299189052.

The spelling of 28436838 in words is "twenty-eight million, four hundred thirty-six thousand, eight hundred thirty-eight".