1220644900 has 36 divisors (see below), whose sum is σ = 2669047920. Its totient is φ = 484525600.

The previous prime is 1220644889. The next prime is 1220644967. The reversal of 1220644900 is 94460221.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 33490 + ... + 59689.

It is an arithmetic number, because the mean of its divisors is an integer number (74140220).

Almost surely, 2^1220644900 is an apocalyptic number.

1220644900 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1220644900 is an abundant number, since it is smaller than the sum of its proper divisors (1448403020).

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

1220644900 is a wasteful number, since it uses less digits than its factorization.

1220644900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93324 (or 93317 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 1220644900 is about 34937.7288901268. The cubic root of 1220644900 is about 1068.7179742578.

The spelling of 1220644900 in words is "one billion, two hundred twenty million, six hundred forty-four thousand, nine hundred".