28642203238 has 32 divisors (see below), whose sum is σ = 47480090112. Its totient is φ = 12849760800.

The previous prime is 28642203203. The next prime is 28642203241. The reversal of 28642203238 is 83230224682.

It is a self number, because there is not a number n which added to its sum of digits gives 28642203238.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2006968 + ... + 2021188.

It is an arithmetic number, because the mean of its divisors is an integer number (1483752816).

Almost surely, 2^28642203238 is an apocalyptic number.

28642203238 is a deficient number, since it is larger than the sum of its proper divisors (18837886874).

28642203238 is a wasteful number, since it uses less digits than its factorization.

28642203238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15420.

The product of its (nonzero) digits is 221184, while the sum is 40.

The spelling of 28642203238 in words is "twenty-eight billion, six hundred forty-two million, two hundred three thousand, two hundred thirty-eight".