687681034 has 4 divisors (see below), whose sum is σ = 1031521554. Its totient is φ = 343840516.

The previous prime is 687681019. The next prime is 687681037. The reversal of 687681034 is 430186786.

687681034 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 685130625 + 2550409 = 26175^2 + 1597^2 .

It is not an unprimeable number, because it can be changed into a prime (687681037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 171920257 + ... + 171920260.

Almost surely, 2^687681034 is an apocalyptic number.

687681034 is a deficient number, since it is larger than the sum of its proper divisors (343840520).

687681034 is a wasteful number, since it uses less digits than its factorization.

687681034 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 343840519.

The product of its (nonzero) digits is 193536, while the sum is 43.

The square root of 687681034 is about 26223.6731599522. The cubic root of 687681034 is about 882.6645452850.

The spelling of 687681034 in words is "six hundred eighty-seven million, six hundred eighty-one thousand, thirty-four".