687939439 has 8 divisors (see below), whose sum is σ = 757365840. Its totient is φ = 619660800.

The previous prime is 687939437. The next prime is 687939449. The reversal of 687939439 is 934939786.

687939439 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 687939439 - 2¹ = 687939437 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (687939433) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 285682 + ... + 288079.

It is an arithmetic number, because the mean of its divisors is an integer number (94670730).

Almost surely, 2^687939439 is an apocalyptic number.

687939439 is a deficient number, since it is larger than the sum of its proper divisors (69426401).

687939439 is a wasteful number, since it uses less digits than its factorization.

687939439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 573881.

The product of its digits is 8817984, while the sum is 58.

The square root of 687939439 is about 26228.5996385625. The cubic root of 687939439 is about 882.7750889614.

The spelling of 687939439 in words is "six hundred eighty-seven million, nine hundred thirty-nine thousand, four hundred thirty-nine".