28327742278220 has 384 divisors, whose sum is σ = 75588534927360. Its totient is φ = 8661856020480.

The previous prime is 28327742278193. The next prime is 28327742278229. The reversal of 28327742278220 is 2287224772382.

It is not an unprimeable number, because it can be changed into a prime (28327742278229) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 13975204847 + ... + 13975206873.

It is an arithmetic number, because the mean of its divisors is an integer number (196845143040).

Almost surely, 2^{28327742278220} is an apocalyptic number.

28327742278220 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 28327742278220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37794267463680).

28327742278220 is an abundant number, since it is smaller than the sum of its proper divisors (47260792649140).

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

28327742278220 is a wasteful number, since it uses less digits than its factorization.

28327742278220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2813 (or 2811 counting only the distinct ones).

The product of its (nonzero) digits is 16859136, while the sum is 56.

The spelling of 28327742278220 in words is "twenty-eight trillion, three hundred twenty-seven billion, seven hundred forty-two million, two hundred seventy-eight thousand, two hundred twenty".