28438847164 has 72 divisors (see below), whose sum is σ = 62384224560. Its totient is φ = 11243764224.

The previous prime is 28438847123. The next prime is 28438847221. The reversal of 28438847164 is 46174883482.

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, 7690564 + ... + 7694260.

Almost surely, 2^28438847164 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 28438847164, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31192112280).

28438847164 is an abundant number, since it is smaller than the sum of its proper divisors (33945377396).

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

28438847164 is a wasteful number, since it uses less digits than its factorization.

28438847164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6747 (or 6738 counting only the distinct ones).

The product of its digits is 8257536, while the sum is 55.

The spelling of 28438847164 in words is "twenty-eight billion, four hundred thirty-eight million, eight hundred forty-seven thousand, one hundred sixty-four".