28078081290 has 96 divisors (see below), whose sum is σ = 83699156736. Its totient is φ = 6397297920.

The previous prime is 28078081279. The next prime is 28078081309. The reversal of 28078081290 is 9218087082.

It is a happy number.

28078081290 is a `hidden beast` number, since 280 + 7 + 8 + 0 + 81 + 290 = 666.

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

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 125995 + ... + 268385.

It is an arithmetic number, because the mean of its divisors is an integer number (871866216).

Almost surely, 2^28078081290 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28078081290, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41849578368).

28078081290 is an abundant number, since it is smaller than the sum of its proper divisors (55621075446).

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

28078081290 is a wasteful number, since it uses less digits than its factorization.

28078081290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142724 (or 142721 counting only the distinct ones).

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

The spelling of 28078081290 in words is "twenty-eight billion, seventy-eight million, eighty-one thousand, two hundred ninety".