28185905020 has 192 divisors, whose sum is σ = 73915269120. Its totient is φ = 8790985728.

The previous prime is 28185904993. The next prime is 28185905057. The reversal of 28185905020 is 2050958182.

It is a super-2 number, since 2×28185905020² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 45534271 + ... + 45534889.

It is an arithmetic number, because the mean of its divisors is an integer number (384975360).

Almost surely, 2^28185905020 is an apocalyptic number.

28185905020 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 28185905020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36957634560).

28185905020 is an abundant number, since it is smaller than the sum of its proper divisors (45729364100).

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

28185905020 is a wasteful number, since it uses less digits than its factorization.

28185905020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 972 (or 970 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 40.

The spelling of 28185905020 in words is "twenty-eight billion, one hundred eighty-five million, nine hundred five thousand, twenty".