28636394438 has 8 divisors (see below), whose sum is σ = 42992844888. Its totient is φ = 14305446144.

The previous prime is 28636394401. The next prime is 28636394489. The reversal of 28636394438 is 83449363682.

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

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, 6372731 + ... + 6377222.

It is an arithmetic number, because the mean of its divisors is an integer number (5374105611).

Almost surely, 2^28636394438 is an apocalyptic number.

28636394438 is a deficient number, since it is larger than the sum of its proper divisors (14356450450).

28636394438 is a wasteful number, since it uses less digits than its factorization.

28636394438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12751078.

The product of its digits is 17915904, while the sum is 56.

The spelling of 28636394438 in words is "twenty-eight billion, six hundred thirty-six million, three hundred ninety-four thousand, four hundred thirty-eight".