1220942688 has 384 divisors, whose sum is σ = 4087480320. Its totient is φ = 311592960.

The previous prime is 1220942683. The next prime is 1220942743. The reversal of 1220942688 is 8862490221.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220942683) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 25977481 + ... + 25977527.

It is an arithmetic number, because the mean of its divisors is an integer number (10644480).

Almost surely, 2^1220942688 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 1220942688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2043740160).

1220942688 is an abundant number, since it is smaller than the sum of its proper divisors (2866537632).

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

1220942688 is a wasteful number, since it uses less digits than its factorization.

1220942688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170 (or 162 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 42.

The square root of 1220942688 is about 34941.9903268260. The cubic root of 1220942688 is about 1068.8048751824.

The spelling of 1220942688 in words is "one billion, two hundred twenty million, nine hundred forty-two thousand, six hundred eighty-eight".