1220856800 has 36 divisors (see below), whose sum is σ = 2980418616. Its totient is φ = 488342400.

The previous prime is 1220856779. The next prime is 1220856803. The reversal of 1220856800 is 86580221.

It is a super-2 number, since 2×1220856800² = 2980982652212480000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220856803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 762236 + ... + 763835.

It is an arithmetic number, because the mean of its divisors is an integer number (82789406).

Almost surely, 2^1220856800 is an apocalyptic number.

1220856800 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1220856800 is an abundant number, since it is smaller than the sum of its proper divisors (1759561816).

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

1220856800 is a wasteful number, since it uses less digits than its factorization.

1220856800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1526091 (or 1526078 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 32.

The square root of 1220856800 is about 34940.7612968006. The cubic root of 1220856800 is about 1068.7798126722.

The spelling of 1220856800 in words is "one billion, two hundred twenty million, eight hundred fifty-six thousand, eight hundred".