28187442838 has 4 divisors (see below), whose sum is σ = 42281164260. Its totient is φ = 14093721418.

The previous prime is 28187442821. The next prime is 28187442919. The reversal of 28187442838 is 83824478182.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7046860708 + ... + 7046860711.

It is an arithmetic number, because the mean of its divisors is an integer number (10570291065).

Almost surely, 2^28187442838 is an apocalyptic number.

28187442838 is a deficient number, since it is larger than the sum of its proper divisors (14093721422).

28187442838 is a wasteful number, since it uses less digits than its factorization.

28187442838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14093721421.

The product of its digits is 5505024, while the sum is 55.

The spelling of 28187442838 in words is "twenty-eight billion, one hundred eighty-seven million, four hundred forty-two thousand, eight hundred thirty-eight".