28555836938 has 8 divisors (see below), whose sum is σ = 45353388132. Its totient is φ = 13438040896.

The previous prime is 28555836937. The next prime is 28555836973. The reversal of 28555836938 is 83963855582.

It can be written as a sum of positive squares in 2 ways, for example, as 28524845449 + 30991489 = 168893^2 + 5567^2 .

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

It is not an unprimeable number, because it can be changed into a prime (28555836931) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 419938745 + ... + 419938812.

Almost surely, 2^28555836938 is an apocalyptic number.

28555836938 is a deficient number, since it is larger than the sum of its proper divisors (16797551194).

28555836938 is a wasteful number, since it uses less digits than its factorization.

28555836938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 839877576.

The product of its digits is 62208000, while the sum is 62.

The spelling of 28555836938 in words is "twenty-eight billion, five hundred fifty-five million, eight hundred thirty-six thousand, nine hundred thirty-eight".