1320011640 has 160 divisors (see below), whose sum is σ = 4521005280. Its totient is φ = 345316608.

The previous prime is 1320011639. The next prime is 1320011663. The reversal of 1320011640 is 461100231.

It is a happy number.

1320011640 is a `hidden beast` number, since 1 + 3 + 20 + 0 + 1 + 1 + 640 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 167877 + ... + 175563.

It is an arithmetic number, because the mean of its divisors is an integer number (28256283).

Almost surely, 2^1320011640 is an apocalyptic number.

1320011640 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 1320011640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2260502640).

1320011640 is an abundant number, since it is smaller than the sum of its proper divisors (3200993640).

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

1320011640 is a wasteful number, since it uses less digits than its factorization.

1320011640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7763 (or 7750 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 1320011640 is about 36331.9644390446. The cubic root of 1320011640 is about 1096.9645348785.

Adding to 1320011640 its reverse (461100231), we get a palindrome (1781111871).

The spelling of 1320011640 in words is "one billion, three hundred twenty million, eleven thousand, six hundred forty".