28321622784 has 432 divisors, whose sum is σ = 104245569792. Its totient is φ = 7467945984.

The previous prime is 28321622761. The next prime is 28321622831. The reversal of 28321622784 is 48722612382.

28321622784 is a `hidden beast` number, since 28 + 321 + 6 + 227 + 84 = 666.

It is a tau number, because it is divible by the number of its divisors (432).

It is a super-2 number, since 2×28321622784² (a number of 22 digits) contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 5658427 + ... + 5663429.

Almost surely, 2^28321622784 is an apocalyptic number.

28321622784 is a gapful number since it is divisible by the number (24) 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 28321622784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (52122784896).

28321622784 is an abundant number, since it is smaller than the sum of its proper divisors (75923947008).

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

28321622784 is an equidigital number, since it uses as much as digits as its factorization.

28321622784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5054 (or 5028 counting only the distinct ones).

The product of its digits is 516096, while the sum is 45.

The spelling of 28321622784 in words is "twenty-eight billion, three hundred twenty-one million, six hundred twenty-two thousand, seven hundred eighty-four".