1220316780 has 96 divisors (see below), whose sum is σ = 3702150144. Its totient is φ = 299142144.

The previous prime is 1220316739. The next prime is 1220316787. The reversal of 1220316780 is 876130221.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (1220316787) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 29949 + ... + 57771.

It is an arithmetic number, because the mean of its divisors is an integer number (38564064).

Almost surely, 2^1220316780 is an apocalyptic number.

1220316780 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 1220316780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1851075072).

1220316780 is an abundant number, since it is smaller than the sum of its proper divisors (2481833364).

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

1220316780 is a wasteful number, since it uses less digits than its factorization.

1220316780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27895 (or 27893 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 30.

The square root of 1220316780 is about 34933.0327913280. The cubic root of 1220316780 is about 1068.6222054372.

The spelling of 1220316780 in words is "one billion, two hundred twenty million, three hundred sixteen thousand, seven hundred eighty".