28383880887880 has 128 divisors (see below), whose sum is σ = 74076271476480. Its totient is φ = 9587401436160.

The previous prime is 28383880887847. The next prime is 28383880887881. The reversal of 28383880887880 is 8878808838382.

It is a self number, because there is not a number n which added to its sum of digits gives 28383880887880.

It is not an unprimeable number, because it can be changed into a prime (28383880887881) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2805654 + ... + 8039866.

It is an arithmetic number, because the mean of its divisors is an integer number (578720870910).

Almost surely, 2^{28383880887880} is an apocalyptic number.

28383880887880 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 28383880887880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37038135738240).

28383880887880 is an abundant number, since it is smaller than the sum of its proper divisors (45692390588600).

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

28383880887880 is a wasteful number, since it uses less digits than its factorization.

28383880887880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5234519 (or 5234515 counting only the distinct ones).

The product of its (nonzero) digits is 2113929216, while the sum is 79.

The spelling of 28383880887880 in words is "twenty-eight trillion, three hundred eighty-three billion, eight hundred eighty million, eight hundred eighty-seven thousand, eight hundred eighty".