28581912409638 has 32 divisors (see below), whose sum is σ = 65695058069760. Its totient is φ = 8120639118240.

The previous prime is 28581912409627. The next prime is 28581912409657. The reversal of 28581912409638 is 83690421918582.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1900891153 + ... + 1900906188.

It is an arithmetic number, because the mean of its divisors is an integer number (2052970564680).

Almost surely, 2^{28581912409638} is an apocalyptic number.

28581912409638 is an abundant number, since it is smaller than the sum of its proper divisors (37113145660122).

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

28581912409638 is a wasteful number, since it uses less digits than its factorization.

28581912409638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3801797532.

The product of its (nonzero) digits is 59719680, while the sum is 66.

The spelling of 28581912409638 in words is "twenty-eight trillion, five hundred eighty-one billion, nine hundred twelve million, four hundred nine thousand, six hundred thirty-eight".