28183664820 has 192 divisors, whose sum is σ = 84008171520. Its totient is φ = 7040014848.

The previous prime is 28183664783. The next prime is 28183664879. The reversal of 28183664820 is 2846638182.

It is a super-2 number, since 2×28183664820² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 28183664820.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 60350227 + ... + 60350693.

It is an arithmetic number, because the mean of its divisors is an integer number (437542560).

Almost surely, 2^28183664820 is an apocalyptic number.

28183664820 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 28183664820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42004085760).

28183664820 is an abundant number, since it is smaller than the sum of its proper divisors (55824506700).

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

28183664820 is a wasteful number, since it uses less digits than its factorization.

28183664820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 982 (or 980 counting only the distinct ones).

The product of its (nonzero) digits is 884736, while the sum is 48.

The spelling of 28183664820 in words is "twenty-eight billion, one hundred eighty-three million, six hundred sixty-four thousand, eight hundred twenty".