1222287620 has 48 divisors (see below), whose sum is σ = 2696295168. Its totient is φ = 464534400.

The previous prime is 1222287587. The next prime is 1222287673. The reversal of 1222287620 is 267822221.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 60662 + ... + 78258.

It is an arithmetic number, because the mean of its divisors is an integer number (56172816).

Almost surely, 2^1222287620 is an apocalyptic number.

1222287620 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 1222287620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1348147584).

1222287620 is an abundant number, since it is smaller than the sum of its proper divisors (1474007548).

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

1222287620 is a wasteful number, since it uses less digits than its factorization.

1222287620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17780 (or 17778 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 32.

The square root of 1222287620 is about 34961.2302415118. The cubic root of 1222287620 is about 1069.1971792601.

The spelling of 1222287620 in words is "one billion, two hundred twenty-two million, two hundred eighty-seven thousand, six hundred twenty".