28551873620 has 48 divisors (see below), whose sum is σ = 61650288000. Its totient is φ = 11099297664.

The previous prime is 28551873593. The next prime is 28551873703. The reversal of 28551873620 is 2637815582.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 634631 + ... + 678129.

It is an arithmetic number, because the mean of its divisors is an integer number (1284381000).

Almost surely, 2^28551873620 is an apocalyptic number.

28551873620 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 28551873620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30825144000).

28551873620 is an abundant number, since it is smaller than the sum of its proper divisors (33098414380).

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

28551873620 is a wasteful number, since it uses less digits than its factorization.

28551873620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44432 (or 44430 counting only the distinct ones).

The product of its (nonzero) digits is 806400, while the sum is 47.

The spelling of 28551873620 in words is "twenty-eight billion, five hundred fifty-one million, eight hundred seventy-three thousand, six hundred twenty".