28881784880 has 160 divisors (see below), whose sum is σ = 74875207680. Its totient is φ = 10288696320.

The previous prime is 28881784873. The next prime is 28881784909. The reversal of 28881784880 is 8848718882.

It is a super-2 number, since 2×28881784880² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (62).

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, 12346751 + ... + 12349089.

It is an arithmetic number, because the mean of its divisors is an integer number (467970048).

Almost surely, 2^28881784880 is an apocalyptic number.

28881784880 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 28881784880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37437603840).

28881784880 is an abundant number, since it is smaller than the sum of its proper divisors (45993422800).

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

28881784880 is a wasteful number, since it uses less digits than its factorization.

28881784880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2779 (or 2773 counting only the distinct ones).

The product of its (nonzero) digits is 14680064, while the sum is 62.

The spelling of 28881784880 in words is "twenty-eight billion, eight hundred eighty-one million, seven hundred eighty-four thousand, eight hundred eighty".