1312739568 has 80 divisors (see below), whose sum is σ = 4306351360. Its totient is φ = 375067584.

The previous prime is 1312739531. The next prime is 1312739569. The reversal of 1312739568 is 8659372131.

1312739568 is a `hidden beast` number, since 1 + 3 + 12 + 73 + 9 + 568 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1312739569) 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, 214030 + ... + 220077.

It is an arithmetic number, because the mean of its divisors is an integer number (53829392).

Almost surely, 2^1312739568 is an apocalyptic number.

1312739568 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1312739568 is an abundant number, since it is smaller than the sum of its proper divisors (2993611792).

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

1312739568 is a wasteful number, since it uses less digits than its factorization.

1312739568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 434131 (or 434119 counting only the distinct ones).

The product of its digits is 272160, while the sum is 45.

The square root of 1312739568 is about 36231.7480671303. The cubic root of 1312739568 is about 1094.9463963251.

The spelling of 1312739568 in words is "one billion, three hundred twelve million, seven hundred thirty-nine thousand, five hundred sixty-eight".