1320360640 has 56 divisors (see below), whose sum is σ = 3149998272. Its totient is φ = 527155200.

The previous prime is 1320360631. The next prime is 1320360667. The reversal of 1320360640 is 460630231.

It is a super-2 number, since 2×1320360640² = 3486704439322419200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 181065 + ... + 188215.

Almost surely, 2^1320360640 is an apocalyptic number.

1320360640 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 1320360640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1574999136).

1320360640 is an abundant number, since it is smaller than the sum of its proper divisors (1829637632).

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

1320360640 is an equidigital number, since it uses as much as digits as its factorization.

1320360640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7745 (or 7735 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 25.

The square root of 1320360640 is about 36336.7670548716. The cubic root of 1320360640 is about 1097.0612024320.

Adding to 1320360640 its reverse (460630231), we get a palindrome (1780990871).

The spelling of 1320360640 in words is "one billion, three hundred twenty million, three hundred sixty thousand, six hundred forty".