28424173820 has 72 divisors (see below), whose sum is σ = 69579943776. Its totient is φ = 9725256576.

The previous prime is 28424173807. The next prime is 28424173837. The reversal of 28424173820 is 2837142482.

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, 447482 + ... + 507038.

It is an arithmetic number, because the mean of its divisors is an integer number (966388108).

Almost surely, 2^28424173820 is an apocalyptic number.

28424173820 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 28424173820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34789971888).

28424173820 is an abundant number, since it is smaller than the sum of its proper divisors (41155769956).

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

28424173820 is a wasteful number, since it uses less digits than its factorization.

28424173820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60067 (or 60058 counting only the distinct ones).

The product of its (nonzero) digits is 172032, while the sum is 41.

The spelling of 28424173820 in words is "twenty-eight billion, four hundred twenty-four million, one hundred seventy-three thousand, eight hundred twenty".