28201580922820 has 96 divisors (see below), whose sum is σ = 63199690646400. Its totient is φ = 10539622001664.

The previous prime is 28201580922797. The next prime is 28201580922833. The reversal of 28201580922820 is 2822908510282.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 389128227 + ... + 389200693.

It is an arithmetic number, because the mean of its divisors is an integer number (658330110900).

Almost surely, 2^{28201580922820} is an apocalyptic number.

28201580922820 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 28201580922820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31599845323200).

28201580922820 is an abundant number, since it is smaller than the sum of its proper divisors (34998109723580).

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

28201580922820 is a wasteful number, since it uses less digits than its factorization.

28201580922820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86597 (or 86595 counting only the distinct ones).

The product of its (nonzero) digits is 737280, while the sum is 49.

The spelling of 28201580922820 in words is "twenty-eight trillion, two hundred one billion, five hundred eighty million, nine hundred twenty-two thousand, eight hundred twenty".