28731144000 has 448 divisors, whose sum is σ = 103686815232. Its totient is φ = 6967296000.

The previous prime is 28731143999. The next prime is 28731144041. The reversal of 28731144000 is 44113782.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 22151352 + ... + 22152648.

It is an arithmetic number, because the mean of its divisors is an integer number (231443784).

Almost surely, 2^28731144000 is an apocalyptic number.

28731144000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28731144000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (51843407616).

28731144000 is an abundant number, since it is smaller than the sum of its proper divisors (74955671232).

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

28731144000 is a wasteful number, since it uses less digits than its factorization.

28731144000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1411 (or 1391 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 30.

Adding to 28731144000 its reverse (44113782), we get a palindrome (28775257782).

The spelling of 28731144000 in words is "twenty-eight billion, seven hundred thirty-one million, one hundred forty-four thousand".