1222064820 has 120 divisors (see below), whose sum is σ = 3846321864. Its totient is φ = 324808704.

The previous prime is 1222064777. The next prime is 1222064827. The reversal of 1222064820 is 284602221.

It is a happy number.

1222064820 is a `hidden beast` number, since 12 + 2 + 2 + 0 + 648 + 2 + 0 = 666.

1222064820 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 142884 + 1221921936 = 378^2 + 34956^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1222064827) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 570792 + ... + 572928.

Almost surely, 2^1222064820 is an apocalyptic number.

1222064820 is a gapful number since it is divisible by the number (10) 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 1222064820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1923160932).

1222064820 is an abundant number, since it is smaller than the sum of its proper divisors (2624257044).

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

1222064820 is a wasteful number, since it uses less digits than its factorization.

1222064820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2511 (or 2500 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 27.

The square root of 1222064820 is about 34958.0437095670. The cubic root of 1222064820 is about 1069.1322104799.

The spelling of 1222064820 in words is "one billion, two hundred twenty-two million, sixty-four thousand, eight hundred twenty".