687432240629 has 2 divisors, whose sum is σ = 687432240630. Its totient is φ = 687432240628.

The previous prime is 687432240619. The next prime is 687432240653. The reversal of 687432240629 is 926042234786.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 393643308100 + 293788932529 = 627410^2 + 542023^2 .

It is a cyclic number.

It is not a de Polignac number, because 687432240629 - 2¹⁶ = 687432175093 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (687432240619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343716120314 + 343716120315.

It is an arithmetic number, because the mean of its divisors is an integer number (343716120315).

Almost surely, 2^687432240629 is an apocalyptic number.

It is an amenable number.

687432240629 is a deficient number, since it is larger than the sum of its proper divisors (1).

687432240629 is an equidigital number, since it uses as much as digits as its factorization.

687432240629 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6967296, while the sum is 53.

The spelling of 687432240629 in words is "six hundred eighty-seven billion, four hundred thirty-two million, two hundred forty thousand, six hundred twenty-nine".