28390161888 has 144 divisors (see below), whose sum is σ = 88255440000. Its totient is φ = 8585360640.

The previous prime is 28390161847. The next prime is 28390161913. The reversal of 28390161888 is 88816109382.

It is a tau number, because it is divible by the number of its divisors (144).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1571853 + ... + 1589811.

It is an arithmetic number, because the mean of its divisors is an integer number (612885000).

Almost surely, 2^28390161888 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28390161888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44127720000).

28390161888 is an abundant number, since it is smaller than the sum of its proper divisors (59865278112).

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

28390161888 is a wasteful number, since it uses less digits than its factorization.

28390161888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18485 (or 18474 counting only the distinct ones).

The product of its (nonzero) digits is 1327104, while the sum is 54.

The spelling of 28390161888 in words is "twenty-eight billion, three hundred ninety million, one hundred sixty-one thousand, eight hundred eighty-eight".