2221779680 has 24 divisors (see below), whose sum is σ = 5248954872. Its totient is φ = 888711808.

The previous prime is 2221779673. The next prime is 2221779689. The reversal of 2221779680 is 869771222.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2221779689) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6942902 + ... + 6943221.

It is an arithmetic number, because the mean of its divisors is an integer number (218706453).

Almost surely, 2^2221779680 is an apocalyptic number.

2221779680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2221779680 is an abundant number, since it is smaller than the sum of its proper divisors (3027175192).

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

2221779680 is a wasteful number, since it uses less digits than its factorization.

2221779680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13886138 (or 13886130 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 44.

The square root of 2221779680 is about 47135.7579762965. The cubic root of 2221779680 is about 1304.8692499274.

The spelling of 2221779680 in words is "two billion, two hundred twenty-one million, seven hundred seventy-nine thousand, six hundred eighty".