1220971620 has 96 divisors (see below), whose sum is σ = 3948932736. Its totient is φ = 278579200.

The previous prime is 1220971589. The next prime is 1220971639. The reversal of 1220971620 is 261790221.

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

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 43191 + ... + 65630.

It is an arithmetic number, because the mean of its divisors is an integer number (41134716).

Almost surely, 2^1220971620 is an apocalyptic number.

1220971620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1220971620 is an abundant number, since it is smaller than the sum of its proper divisors (2727961116).

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

1220971620 is a wasteful number, since it uses less digits than its factorization.

1220971620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108861 (or 108859 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 30.

The square root of 1220971620 is about 34942.4043248315. The cubic root of 1220971620 is about 1068.8133174074.

The spelling of 1220971620 in words is "one billion, two hundred twenty million, nine hundred seventy-one thousand, six hundred twenty".