28394436 has 48 divisors (see below), whose sum is σ = 79708160. Its totient is φ = 7685280.

The previous prime is 28394413. The next prime is 28394441. The reversal of 28394436 is 63449382.

It is a junction number, because it is equal to n+sod(n) for n = 28394394 and 28394403.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7300 + ... + 10491.

Almost surely, 2^28394436 is an apocalyptic number.

It is an amenable number.

28394436 is an abundant number, since it is smaller than the sum of its proper divisors (51313724).

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

28394436 is a wasteful number, since it uses less digits than its factorization.

28394436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17824 (or 17822 counting only the distinct ones).

The product of its digits is 124416, while the sum is 39.

The square root of 28394436 is about 5328.6429792209. The cubic root of 28394436 is about 305.0781345998.

The spelling of 28394436 in words is "twenty-eight million, three hundred ninety-four thousand, four hundred thirty-six".