28638633044 has 48 divisors (see below), whose sum is σ = 60312309120. Its totient is φ = 11623772160.

The previous prime is 28638632929. The next prime is 28638633053. The reversal of 28638633044 is 44033683682.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 28638633044.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1959524 + ... + 1974084.

It is an arithmetic number, because the mean of its divisors is an integer number (1256506440).

Almost surely, 2^28638633044 is an apocalyptic number.

It is an amenable number.

28638633044 is an abundant number, since it is smaller than the sum of its proper divisors (31673676076).

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

28638633044 is a wasteful number, since it uses less digits than its factorization.

28638633044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18288 (or 18286 counting only the distinct ones).

The product of its (nonzero) digits is 1990656, while the sum is 47.

The spelling of 28638633044 in words is "twenty-eight billion, six hundred thirty-eight million, six hundred thirty-three thousand, forty-four".