684716623 has 8 divisors (see below), whose sum is σ = 744005120. Its totient is φ = 627753240.

The previous prime is 684716587. The next prime is 684716629. The reversal of 684716623 is 326617486.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 684716623 - 2⁹ = 684716111 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 684716623.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (684716629) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 580665 + ... + 581842.

It is an arithmetic number, because the mean of its divisors is an integer number (93000640).

Almost surely, 2^684716623 is an apocalyptic number.

684716623 is a deficient number, since it is larger than the sum of its proper divisors (59288497).

684716623 is a wasteful number, since it uses less digits than its factorization.

684716623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1162557.

The product of its digits is 290304, while the sum is 43.

The square root of 684716623 is about 26167.0904572901. The cubic root of 684716623 is about 881.3944073464.

The spelling of 684716623 in words is "six hundred eighty-four million, seven hundred sixteen thousand, six hundred twenty-three".