684747023 has 4 divisors (see below), whose sum is σ = 720786360. Its totient is φ = 648707688.

The previous prime is 684747017. The next prime is 684747031. The reversal of 684747023 is 320747486.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-684747023 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (684747223) 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 in 3 ways as a sum of consecutive naturals, for example, 18019640 + ... + 18019677.

It is an arithmetic number, because the mean of its divisors is an integer number (180196590).

Almost surely, 2^684747023 is an apocalyptic number.

684747023 is a deficient number, since it is larger than the sum of its proper divisors (36039337).

684747023 is a wasteful number, since it uses less digits than its factorization.

684747023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36039336.

The product of its (nonzero) digits is 225792, while the sum is 41.

The square root of 684747023 is about 26167.6713331546. The cubic root of 684747023 is about 881.4074511821.

The spelling of 684747023 in words is "six hundred eighty-four million, seven hundred forty-seven thousand, twenty-three".