28182878638 has 8 divisors (see below), whose sum is σ = 44499282120. Its totient is φ = 13349784600.

The previous prime is 28182878611. The next prime is 28182878641. The reversal of 28182878638 is 83687828182.

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, 370827313 + ... + 370827388.

It is an arithmetic number, because the mean of its divisors is an integer number (5562410265).

Almost surely, 2^28182878638 is an apocalyptic number.

28182878638 is a deficient number, since it is larger than the sum of its proper divisors (16316403482).

28182878638 is a wasteful number, since it uses less digits than its factorization.

28182878638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 741654722.

The product of its digits is 16515072, while the sum is 61.

The spelling of 28182878638 in words is "twenty-eight billion, one hundred eighty-two million, eight hundred seventy-eight thousand, six hundred thirty-eight".