1327688757 has 12 divisors (see below), whose sum is σ = 1928370444. Its totient is φ = 880234560.

The previous prime is 1327688753. The next prime is 1327688771. The reversal of 1327688757 is 7578867231.

It can be written as a sum of positive squares in 2 ways, for example, as 458559396 + 869129361 = 21414^2 + 29481^2 .

It is not a de Polignac number, because 1327688757 - 2² = 1327688753 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1327688753) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 405888 + ... + 409145.

It is an arithmetic number, because the mean of its divisors is an integer number (160697537).

Almost surely, 2^1327688757 is an apocalyptic number.

It is an amenable number.

1327688757 is a deficient number, since it is larger than the sum of its proper divisors (600681687).

1327688757 is a wasteful number, since it uses less digits than its factorization.

1327688757 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 815220 (or 815217 counting only the distinct ones).

The product of its digits is 3951360, while the sum is 54.

The square root of 1327688757 is about 36437.4636466371. The cubic root of 1327688757 is about 1099.0870543556.

The spelling of 1327688757 in words is "one billion, three hundred twenty-seven million, six hundred eighty-eight thousand, seven hundred fifty-seven".