28133640020 has 24 divisors (see below), whose sum is σ = 61649368704. Its totient is φ = 10764175136.

The previous prime is 28133640019. The next prime is 28133640037. The reversal of 28133640020 is 2004633182.

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 7 ways as a sum of consecutive naturals, for example, 30579584 + ... + 30580503.

It is an arithmetic number, because the mean of its divisors is an integer number (2568723696).

Almost surely, 2^28133640020 is an apocalyptic number.

28133640020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28133640020 is an abundant number, since it is smaller than the sum of its proper divisors (33515728684).

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

28133640020 is a wasteful number, since it uses less digits than its factorization.

28133640020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61160119 (or 61160117 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 29.

The spelling of 28133640020 in words is "twenty-eight billion, one hundred thirty-three million, six hundred forty thousand, twenty".