1222887720 has 32 divisors (see below), whose sum is σ = 3668663520. Its totient is φ = 326103360.

The previous prime is 1222887697. The next prime is 1222887733. The reversal of 1222887720 is 277882221.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 5095246 + ... + 5095485.

It is an arithmetic number, because the mean of its divisors is an integer number (114645735).

Almost surely, 2^1222887720 is an apocalyptic number.

1222887720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1222887720 is an abundant number, since it is smaller than the sum of its proper divisors (2445775800).

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

1222887720 is a wasteful number, since it uses less digits than its factorization.

1222887720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10190745 (or 10190741 counting only the distinct ones).

The product of its (nonzero) digits is 50176, while the sum is 39.

The square root of 1222887720 is about 34969.8115522518. The cubic root of 1222887720 is about 1069.3721299673.

The spelling of 1222887720 in words is "one billion, two hundred twenty-two million, eight hundred eighty-seven thousand, seven hundred twenty".