28394236394 has 16 divisors (see below), whose sum is σ = 43017449280. Its totient is φ = 14055167520.

The previous prime is 28394236373. The next prime is 28394236399. The reversal of 28394236394 is 49363249382.

It is a happy number.

It is a Smith number, since the sum of its digits (53) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (28394236399) 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, 758129 + ... + 794699.

It is an arithmetic number, because the mean of its divisors is an integer number (2688590580).

Almost surely, 2^28394236394 is an apocalyptic number.

28394236394 is a deficient number, since it is larger than the sum of its proper divisors (14623212886).

28394236394 is a wasteful number, since it uses less digits than its factorization.

28394236394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40445.

The product of its digits is 6718464, while the sum is 53.

The spelling of 28394236394 in words is "twenty-eight billion, three hundred ninety-four million, two hundred thirty-six thousand, three hundred ninety-four".