687684039 has 8 divisors (see below), whose sum is σ = 1047899520. Its totient is φ = 392962296.

The previous prime is 687684031. The next prime is 687684059. The reversal of 687684039 is 930486786.

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

It is not a de Polignac number, because 687684039 - 2³ = 687684031 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 687683982 and 687684000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (687684031) 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, 16373409 + ... + 16373450.

It is an arithmetic number, because the mean of its divisors is an integer number (130987440).

Almost surely, 2^687684039 is an apocalyptic number.

687684039 is a deficient number, since it is larger than the sum of its proper divisors (360215481).

687684039 is a wasteful number, since it uses less digits than its factorization.

687684039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32746869.

The product of its (nonzero) digits is 1741824, while the sum is 51.

The square root of 687684039 is about 26223.7304554482. The cubic root of 687684039 is about 882.6658309601.

The spelling of 687684039 in words is "six hundred eighty-seven million, six hundred eighty-four thousand, thirty-nine".