28295840220816 has 320 divisors, whose sum is σ = 90989004902400. Its totient is φ = 7393314797568.

The previous prime is 28295840220779. The next prime is 28295840220827. The reversal of 28295840220816 is 61802204859282.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1023232846 + ... + 1023260498.

It is an arithmetic number, because the mean of its divisors is an integer number (284340640320).

Almost surely, 2^{28295840220816} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28295840220816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45494502451200).

28295840220816 is an abundant number, since it is smaller than the sum of its proper divisors (62693164681584).

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

28295840220816 is a wasteful number, since it uses less digits than its factorization.

28295840220816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33246 (or 33240 counting only the distinct ones).

The product of its (nonzero) digits is 8847360, while the sum is 57.

The spelling of 28295840220816 in words is "twenty-eight trillion, two hundred ninety-five billion, eight hundred forty million, two hundred twenty thousand, eight hundred sixteen".