684718965 has 24 divisors (see below), whose sum is σ = 1356396288. Its totient is φ = 313014240.

The previous prime is 684718939. The next prime is 684718973. The reversal of 684718965 is 569817486.

It is not a de Polignac number, because 684718965 - 2⁹ = 684718453 is a prime.

It is a super-2 number, since 2×684718965² = 937680122061342450, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1086541 + ... + 1087170.

It is an arithmetic number, because the mean of its divisors is an integer number (56516512).

Almost surely, 2^684718965 is an apocalyptic number.

It is an amenable number.

684718965 is a deficient number, since it is larger than the sum of its proper divisors (671677323).

684718965 is a wasteful number, since it uses less digits than its factorization.

684718965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2173729 (or 2173726 counting only the distinct ones).

The product of its digits is 2903040, while the sum is 54.

The square root of 684718965 is about 26167.1352081194. The cubic root of 684718965 is about 881.3954122503.

The spelling of 684718965 in words is "six hundred eighty-four million, seven hundred eighteen thousand, nine hundred sixty-five".