1220453568 has 140 divisors (see below), whose sum is σ = 3634234032. Its totient is φ = 404974080.

The previous prime is 1220453561. The next prime is 1220453573. The reversal of 1220453568 is 8653540221.

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

It is not an unprimeable number, because it can be changed into a prime (1220453561) by changing a digit.

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 19 ways as a sum of consecutive naturals, for example, 1611846 + ... + 1612602.

Almost surely, 2^1220453568 is an apocalyptic number.

1220453568 is a gapful number since it is divisible by the number (18) 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 1220453568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1817117016).

1220453568 is an abundant number, since it is smaller than the sum of its proper divisors (2413780464).

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

1220453568 is an equidigital number, since it uses as much as digits as its factorization.

1220453568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1092 (or 1073 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 36.

The square root of 1220453568 is about 34934.9905968214. The cubic root of 1220453568 is about 1068.6621320189.

Adding to 1220453568 its reverse (8653540221), we get a palindrome (9873993789).

The spelling of 1220453568 in words is "one billion, two hundred twenty million, four hundred fifty-three thousand, five hundred sixty-eight".