8221998780 has 36 divisors (see below), whose sum is σ = 24940063512. Its totient is φ = 2192532960.

The previous prime is 8221998767. The next prime is 8221998791. The reversal of 8221998780 is 878991228.

It is a tau number, because it is divible by the number of its divisors (36).

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 22838706 + ... + 22839065.

It is an arithmetic number, because the mean of its divisors is an integer number (692779542).

Almost surely, 2^8221998780 is an apocalyptic number.

It is an amenable number.

8221998780 is an abundant number, since it is smaller than the sum of its proper divisors (16718064732).

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

8221998780 is a wasteful number, since it uses less digits than its factorization.

8221998780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45677786 (or 45677781 counting only the distinct ones).

The product of its (nonzero) digits is 1161216, while the sum is 54.

The square root of 8221998780 is about 90675.2379649483. The cubic root of 8221998780 is about 2018.3313655148.

It can be divided in two parts, 8221 and 998780, that added together give a palindrome (1007001).

The spelling of 8221998780 in words is "eight billion, two hundred twenty-one million, nine hundred ninety-eight thousand, seven hundred eighty".