687971692 has 6 divisors (see below), whose sum is σ = 1203950468. Its totient is φ = 343985844.

The previous prime is 687971689. The next prime is 687971693. The reversal of 687971692 is 296179786.

It is not an unprimeable number, because it can be changed into a prime (687971693) 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, 85996458 + ... + 85996465.

Almost surely, 2^687971692 is an apocalyptic number.

It is an amenable number.

687971692 is a deficient number, since it is larger than the sum of its proper divisors (515978776).

687971692 is a wasteful number, since it uses less digits than its factorization.

687971692 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171992927 (or 171992925 counting only the distinct ones).

The product of its digits is 2286144, while the sum is 55.

The square root of 687971692 is about 26229.2144754661. The cubic root of 687971692 is about 882.7888846041.

The spelling of 687971692 in words is "six hundred eighty-seven million, nine hundred seventy-one thousand, six hundred ninety-two".