1320725656 has 64 divisors (see below), whose sum is σ = 2681553600. Its totient is φ = 608444928.

The previous prime is 1320725639. The next prime is 1320725657. The reversal of 1320725656 is 6565270231.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1320725657) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 453501 + ... + 456403.

It is an arithmetic number, because the mean of its divisors is an integer number (41899275).

Almost surely, 2^1320725656 is an apocalyptic number.

It is an amenable number.

1320725656 is an abundant number, since it is smaller than the sum of its proper divisors (1360827944).

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

1320725656 is a wasteful number, since it uses less digits than its factorization.

1320725656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3028 (or 3024 counting only the distinct ones).

The product of its (nonzero) digits is 75600, while the sum is 37.

The square root of 1320725656 is about 36341.7893890766. The cubic root of 1320725656 is about 1097.1622879446.

Adding to 1320725656 its reverse (6565270231), we get a palindrome (7885995887).

The spelling of 1320725656 in words is "one billion, three hundred twenty million, seven hundred twenty-five thousand, six hundred fifty-six".