28336825638 has 24 divisors (see below), whose sum is σ = 66977951976. Its totient is φ = 8586916800.

The previous prime is 28336825633. The next prime is 28336825639. The reversal of 28336825638 is 83652863382.

28336825638 is a `hidden beast` number, since 28 + 3 + 368 + 256 + 3 + 8 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28336825633) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 71557443 + ... + 71557838.

It is an arithmetic number, because the mean of its divisors is an integer number (2790747999).

Almost surely, 2^28336825638 is an apocalyptic number.

28336825638 is an abundant number, since it is smaller than the sum of its proper divisors (38641126338).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28336825638 is a wasteful number, since it uses less digits than its factorization.

28336825638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143115300 (or 143115297 counting only the distinct ones).

The product of its digits is 9953280, while the sum is 54.

The spelling of 28336825638 in words is "twenty-eight billion, three hundred thirty-six million, eight hundred twenty-five thousand, six hundred thirty-eight".