28319891382 has 64 divisors (see below), whose sum is σ = 64064682240. Its totient is φ = 9271075968.

The previous prime is 28319891377. The next prime is 28319891389.

28319891382 is nontrivially palindromic in base 10.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28319891389) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1207653 + ... + 1230879.

It is an arithmetic number, because the mean of its divisors is an integer number (1001010660).

Almost surely, 2^28319891382 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28319891382, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32032341120).

28319891382 is an abundant number, since it is smaller than the sum of its proper divisors (35744790858).

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

28319891382 is a wasteful number, since it uses less digits than its factorization.

28319891382 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23642 (or 23636 counting only the distinct ones).

The product of its digits is 1492992, while the sum is 54.

The spelling of 28319891382 in words is "twenty-eight billion, three hundred nineteen million, eight hundred ninety-one thousand, three hundred eighty-two".