687132938 has 4 divisors (see below), whose sum is σ = 1030699410. Its totient is φ = 343566468.

The previous prime is 687132937. The next prime is 687132961. The reversal of 687132938 is 839231786.

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., 476679889 + 210453049 = 21833^2 + 14507^2 .

It is a junction number, because it is equal to n+sod(n) for n = 687132892 and 687132901.

It is not an unprimeable number, because it can be changed into a prime (687132937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 171783233 + ... + 171783236.

Almost surely, 2^687132938 is an apocalyptic number.

687132938 is a deficient number, since it is larger than the sum of its proper divisors (343566472).

687132938 is a wasteful number, since it uses less digits than its factorization.

687132938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 343566471.

The product of its digits is 435456, while the sum is 47.

The square root of 687132938 is about 26213.2206720197. The cubic root of 687132938 is about 882.4299823270.

The spelling of 687132938 in words is "six hundred eighty-seven million, one hundred thirty-two thousand, nine hundred thirty-eight".