687337906 has 4 divisors (see below), whose sum is σ = 1031006862. Its totient is φ = 343668952.

The previous prime is 687337891. The next prime is 687337913. The reversal of 687337906 is 609733786.

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., 667757281 + 19580625 = 25841^2 + 4425^2 .

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 687337906.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 171834475 + ... + 171834478.

Almost surely, 2^687337906 is an apocalyptic number.

687337906 is a deficient number, since it is larger than the sum of its proper divisors (343668956).

687337906 is a wasteful number, since it uses less digits than its factorization.

687337906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 343668955.

The product of its (nonzero) digits is 1143072, while the sum is 49.

The square root of 687337906 is about 26217.1300107392. The cubic root of 687337906 is about 882.5177149512.

The spelling of 687337906 in words is "six hundred eighty-seven million, three hundred thirty-seven thousand, nine hundred six".