1320695640 has 144 divisors (see below), whose sum is σ = 4718095200. Its totient is φ = 320158080.

The previous prime is 1320695617. The next prime is 1320695657. The reversal of 1320695640 is 465960231.

It is a happy number.

1320695640 is a `hidden beast` number, since 1 + 3 + 2 + 0 + 6 + 9 + 5 + 640 = 666.

1320695640 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

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

It is a junction number, because it is equal to n+sod(n) for n = 1320695595 and 1320695604.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 28401 + ... + 58719.

It is an arithmetic number, because the mean of its divisors is an integer number (32764550).

Almost surely, 2^1320695640 is an apocalyptic number.

1320695640 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 1320695640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2359047600).

1320695640 is an abundant number, since it is smaller than the sum of its proper divisors (3397399560).

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

1320695640 is a wasteful number, since it uses less digits than its factorization.

1320695640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30358 (or 30340 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

The square root of 1320695640 is about 36341.3764186223. The cubic root of 1320695640 is about 1097.1539761824.

The spelling of 1320695640 in words is "one billion, three hundred twenty million, six hundred ninety-five thousand, six hundred forty".