1320444720 has 320 divisors, whose sum is σ = 5425367040. Its totient is φ = 288617472.

The previous prime is 1320444707. The next prime is 1320444739. The reversal of 1320444720 is 274440231.

1320444720 is a `hidden beast` number, since 13 + 204 + 447 + 2 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 345862 + ... + 349658.

It is an arithmetic number, because the mean of its divisors is an integer number (16954272).

Almost surely, 2^1320444720 is an apocalyptic number.

1320444720 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 1320444720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2712683520).

1320444720 is an abundant number, since it is smaller than the sum of its proper divisors (4104922320).

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

1320444720 is a wasteful number, since it uses less digits than its factorization.

1320444720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3849 (or 3837 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 27.

The square root of 1320444720 is about 36337.9239913345. The cubic root of 1320444720 is about 1097.0844887336.

Adding to 1320444720 its reverse (274440231), we get a palindrome (1594884951).

It can be divided in two parts, 1320 and 444720, that added together give a triangular number (446040 = T₉₄₄).

The spelling of 1320444720 in words is "one billion, three hundred twenty million, four hundred forty-four thousand, seven hundred twenty".