684137206 has 4 divisors (see below), whose sum is σ = 1026205812. Its totient is φ = 342068602.

The previous prime is 684137203. The next prime is 684137221. The reversal of 684137206 is 602731486.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (684137203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 171034300 + ... + 171034303.

It is an arithmetic number, because the mean of its divisors is an integer number (256551453).

Almost surely, 2^684137206 is an apocalyptic number.

684137206 is a deficient number, since it is larger than the sum of its proper divisors (342068606).

684137206 is a wasteful number, since it uses less digits than its factorization.

684137206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 342068605.

The product of its (nonzero) digits is 48384, while the sum is 37.

The square root of 684137206 is about 26156.0166309780. The cubic root of 684137206 is about 881.1457210011.

The spelling of 684137206 in words is "six hundred eighty-four million, one hundred thirty-seven thousand, two hundred six".