4221780520 has 16 divisors (see below), whose sum is σ = 9499006260. Its totient is φ = 1688712192.

The previous prime is 4221780517. The next prime is 4221780529. The reversal of 4221780520 is 250871224.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 3899003364 + 322777156 = 62442^2 + 17966^2 .

It is not an unprimeable number, because it can be changed into a prime (4221780529) 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, 52772217 + ... + 52772296.

Almost surely, 2^4221780520 is an apocalyptic number.

4221780520 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

4221780520 is an abundant number, since it is smaller than the sum of its proper divisors (5277225740).

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

4221780520 is a wasteful number, since it uses less digits than its factorization.

4221780520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105544524 (or 105544520 counting only the distinct ones).

The product of its (nonzero) digits is 8960, while the sum is 31.

The square root of 4221780520 is about 64975.2300496120. The cubic root of 4221780520 is about 1616.2128320227.

The spelling of 4221780520 in words is "four billion, two hundred twenty-one million, seven hundred eighty thousand, five hundred twenty".