28029781080 has 320 divisors, whose sum is σ = 108632715840. Its totient is φ = 6349529088.

The previous prime is 28029781069. The next prime is 28029781121. The reversal of 28029781080 is 8018792082.

It is a happy number.

28029781080 is a `hidden beast` number, since 280 + 297 + 8 + 1 + 0 + 80 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 2557372 + ... + 2568308.

It is an arithmetic number, because the mean of its divisors is an integer number (339477237).

Almost surely, 2^28029781080 is an apocalyptic number.

28029781080 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 28029781080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (54316357920).

28029781080 is an abundant number, since it is smaller than the sum of its proper divisors (80602934760).

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

28029781080 is a wasteful number, since it uses less digits than its factorization.

28029781080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11080 (or 11067 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 45.

The spelling of 28029781080 in words is "twenty-eight billion, twenty-nine million, seven hundred eighty-one thousand, eighty".