28986561280 has 216 divisors, whose sum is σ = 74457589248. Its totient is φ = 10809114624.

The previous prime is 28986561277. The next prime is 28986561283. The reversal of 28986561280 is 8216568982.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (28986561277) and next prime (28986561283).

It is not an unprimeable number, because it can be changed into a prime (28986561283) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 46979532 + ... + 46980148.

Almost surely, 2^28986561280 is an apocalyptic number.

28986561280 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 28986561280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37228794624).

28986561280 is an abundant number, since it is smaller than the sum of its proper divisors (45471027968).

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

28986561280 is a wasteful number, since it uses less digits than its factorization.

28986561280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 799 (or 768 counting only the distinct ones).

The product of its (nonzero) digits is 3317760, while the sum is 55.

The spelling of 28986561280 in words is "twenty-eight billion, nine hundred eighty-six million, five hundred sixty-one thousand, two hundred eighty".