28647823638 has 24 divisors (see below), whose sum is σ = 66650039352. Its totient is φ = 8185092384.

The previous prime is 28647823621. The next prime is 28647823679. The reversal of 28647823638 is 83632874682.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 48720495 + ... + 48721082.

It is an arithmetic number, because the mean of its divisors is an integer number (2777084973).

Almost surely, 2^28647823638 is an apocalyptic number.

28647823638 is an abundant number, since it is smaller than the sum of its proper divisors (38002215714).

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

28647823638 is a wasteful number, since it uses less digits than its factorization.

28647823638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97441596 (or 97441589 counting only the distinct ones).

The product of its digits is 18579456, while the sum is 57.

The spelling of 28647823638 in words is "twenty-eight billion, six hundred forty-seven million, eight hundred twenty-three thousand, six hundred thirty-eight".