28183730840 has 144 divisors (see below), whose sum is σ = 68321253600. Its totient is φ = 10461337600.

The previous prime is 28183730821. The next prime is 28183730867. The reversal of 28183730840 is 4803738182.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 28183730791 and 28183730800.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 117923441 + ... + 117923679.

It is an arithmetic number, because the mean of its divisors is an integer number (474453150).

Almost surely, 2^28183730840 is an apocalyptic number.

28183730840 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 28183730840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34160626800).

28183730840 is an abundant number, since it is smaller than the sum of its proper divisors (40137522760).

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

28183730840 is a wasteful number, since it uses less digits than its factorization.

28183730840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 486 (or 364 counting only the distinct ones).

The product of its (nonzero) digits is 258048, while the sum is 44.

The spelling of 28183730840 in words is "twenty-eight billion, one hundred eighty-three million, seven hundred thirty thousand, eight hundred forty".