28023433880 has 64 divisors (see below), whose sum is σ = 67978945440. Its totient is φ = 10335532032.

The previous prime is 28023433861. The next prime is 28023433927. The reversal of 28023433880 is 8833432082.

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, 441932 + ... + 501348.

Almost surely, 2^28023433880 is an apocalyptic number.

28023433880 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 28023433880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33989472720).

28023433880 is an abundant number, since it is smaller than the sum of its proper divisors (39955511560).

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

28023433880 is a wasteful number, since it uses less digits than its factorization.

28023433880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60348 (or 60344 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 41.

The spelling of 28023433880 in words is "twenty-eight billion, twenty-three million, four hundred thirty-three thousand, eight hundred eighty".