1220755944 has 64 divisors (see below), whose sum is σ = 3159037440. Its totient is φ = 392705280.

The previous prime is 1220755937. The next prime is 1220755967. The reversal of 1220755944 is 4495570221.

It is a super-2 number, since 2×1220755944² = 2980490149622662272, which contains 22 as substring.

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 293302 + ... + 297434.

It is an arithmetic number, because the mean of its divisors is an integer number (49359960).

Almost surely, 2^1220755944 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1220755944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1579518720).

1220755944 is an abundant number, since it is smaller than the sum of its proper divisors (1938281496).

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

1220755944 is a wasteful number, since it uses less digits than its factorization.

1220755944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4570 (or 4566 counting only the distinct ones).

The product of its (nonzero) digits is 100800, while the sum is 39.

The square root of 1220755944 is about 34939.3180242546. The cubic root of 1220755944 is about 1068.7503809307.

The spelling of 1220755944 in words is "one billion, two hundred twenty million, seven hundred fifty-five thousand, nine hundred forty-four".