28221408790008 has 128 divisors (see below), whose sum is σ = 80953574929920. Its totient is φ = 8031167447040.

The previous prime is 28221408789961. The next prime is 28221408790009. The reversal of 28221408790008 is 80009780412282.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28221408790009) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 651547360 + ... + 651590672.

It is an arithmetic number, because the mean of its divisors is an integer number (632449804140).

Almost surely, 2^{28221408790008} is an apocalyptic number.

28221408790008 is a gapful number since it is divisible by the number (28) 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 28221408790008, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40476787464960).

28221408790008 is an abundant number, since it is smaller than the sum of its proper divisors (52732166139912).

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

28221408790008 is a wasteful number, since it uses less digits than its factorization.

28221408790008 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58677 (or 58673 counting only the distinct ones).

The product of its (nonzero) digits is 1032192, while the sum is 51.

The spelling of 28221408790008 in words is "twenty-eight trillion, two hundred twenty-one billion, four hundred eight million, seven hundred ninety thousand, eight".