684616623 has 4 divisors (see below), whose sum is σ = 912822168. Its totient is φ = 456411080.

The previous prime is 684616613. The next prime is 684616637. The reversal of 684616623 is 326616486.

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 684616623 - 2¹⁷ = 684485551 is a prime.

It is a super-3 number, since 3×684616623³ (a number of 27 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (684616613) 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, 114102768 + ... + 114102773.

It is an arithmetic number, because the mean of its divisors is an integer number (228205542).

Almost surely, 2^684616623 is an apocalyptic number.

684616623 is a deficient number, since it is larger than the sum of its proper divisors (228205545).

684616623 is a wasteful number, since it uses less digits than its factorization.

684616623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228205544.

The product of its digits is 248832, while the sum is 42.

The square root of 684616623 is about 26165.1795904404. The cubic root of 684616623 is about 881.3514972680.

The spelling of 684616623 in words is "six hundred eighty-four million, six hundred sixteen thousand, six hundred twenty-three".