687724039 has 2 divisors, whose sum is σ = 687724040. Its totient is φ = 687724038.

The previous prime is 687724027. The next prime is 687724043. The reversal of 687724039 is 930427786.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 687724039 - 2⁵ = 687724007 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 687724039.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (687725039) 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, 343862019 + 343862020.

It is an arithmetic number, because the mean of its divisors is an integer number (343862020).

Almost surely, 2^687724039 is an apocalyptic number.

687724039 is a deficient number, since it is larger than the sum of its proper divisors (1).

687724039 is an equidigital number, since it uses as much as digits as its factorization.

687724039 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 508032, while the sum is 46.

The square root of 687724039 is about 26224.4931123559. The cubic root of 687724039 is about 882.6829444147.

The spelling of 687724039 in words is "six hundred eighty-seven million, seven hundred twenty-four thousand, thirty-nine".