28981774080 has 1296 divisors, whose sum is σ = 130345225920. Its totient is φ = 6019743744.

The previous prime is 28981774061. The next prime is 28981774091. The reversal of 28981774080 is 8047718982.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (1296).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 999371506 + ... + 999371534.

It is an arithmetic number, because the mean of its divisors is an integer number (100575020).

Almost surely, 2^28981774080 is an apocalyptic number.

28981774080 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 28981774080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (65172612960).

28981774080 is an abundant number, since it is smaller than the sum of its proper divisors (101363451840).

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

28981774080 is an frugal number, since it uses more digits than its factorization.

28981774080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98 (or 63 counting only the distinct ones).

The product of its (nonzero) digits is 1806336, while the sum is 54.

The spelling of 28981774080 in words is "twenty-eight billion, nine hundred eighty-one million, seven hundred seventy-four thousand, eighty".