756868639 has 2 divisors, whose sum is σ = 756868640. Its totient is φ = 756868638.

The previous prime is 756868631. The next prime is 756868661. The reversal of 756868639 is 936868657.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 756868639 - 2³ = 756868631 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (756868631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 378434319 + 378434320.

It is an arithmetic number, because the mean of its divisors is an integer number (378434320).

Almost surely, 2^756868639 is an apocalyptic number.

756868639 is a deficient number, since it is larger than the sum of its proper divisors (1).

756868639 is an equidigital number, since it uses as much as digits as its factorization.

756868639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13063680, while the sum is 58.

The square root of 756868639 is about 27511.2456824478. The cubic root of 756868639 is about 911.3254600838.

The spelling of 756868639 in words is "seven hundred fifty-six million, eight hundred sixty-eight thousand, six hundred thirty-nine".