684342679 has 4 divisors (see below), whose sum is σ = 684804384. Its totient is φ = 683880976.

The previous prime is 684342677. The next prime is 684342683. The reversal of 684342679 is 976243486.

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

It is a cyclic number.

It is not a de Polignac number, because 684342679 - 2¹ = 684342677 is a prime.

It is a super-3 number, since 3×684342679³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (684342677) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 228622 + ... + 231595.

It is an arithmetic number, because the mean of its divisors is an integer number (171201096).

Almost surely, 2^684342679 is an apocalyptic number.

684342679 is a deficient number, since it is larger than the sum of its proper divisors (461705).

684342679 is a wasteful number, since it uses less digits than its factorization.

684342679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 461704.

The product of its digits is 1741824, while the sum is 49.

The square root of 684342679 is about 26159.9441704297. The cubic root of 684342679 is about 881.2339262766.

The spelling of 684342679 in words is "six hundred eighty-four million, three hundred forty-two thousand, six hundred seventy-nine".