1222758720 has 224 divisors, whose sum is σ = 4361078400. Its totient is φ = 322486272.

The previous prime is 1222758689. The next prime is 1222758743. The reversal of 1222758720 is 278572221.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

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 31 ways as a sum of consecutive naturals, for example, 837351 + ... + 838809.

It is an arithmetic number, because the mean of its divisors is an integer number (19469100).

Almost surely, 2^1222758720 is an apocalyptic number.

1222758720 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 1222758720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2180539200).

1222758720 is an abundant number, since it is smaller than the sum of its proper divisors (3138319680).

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

1222758720 is a wasteful number, since it uses less digits than its factorization.

1222758720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1582 (or 1566 counting only the distinct ones).

The product of its (nonzero) digits is 31360, while the sum is 36.

The square root of 1222758720 is about 34967.9670555782. The cubic root of 1222758720 is about 1069.3345266634.

The spelling of 1222758720 in words is "one billion, two hundred twenty-two million, seven hundred fifty-eight thousand, seven hundred twenty".