684869913 has 72 divisors (see below), whose sum is σ = 1258490688. Its totient is φ = 355658688.

The previous prime is 684869897. The next prime is 684869917. The reversal of 684869913 is 319968486.

684869913 is a `hidden beast` number, since 68 + 486 + 99 + 13 = 666.

It is not a de Polignac number, because 684869913 - 2⁴ = 684869897 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 684869913.

It is not an unprimeable number, because it can be changed into a prime (684869917) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 383220 + ... + 385002.

Almost surely, 2^684869913 is an apocalyptic number.

684869913 is a gapful number since it is divisible by the number (63) formed by its first and last digit.

It is an amenable number.

684869913 is a deficient number, since it is larger than the sum of its proper divisors (573620775).

684869913 is a wasteful number, since it uses less digits than its factorization.

684869913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1883 (or 1873 counting only the distinct ones).

The product of its digits is 2239488, while the sum is 54.

The square root of 684869913 is about 26170.0193542152. The cubic root of 684869913 is about 881.4601760955.

The spelling of 684869913 in words is "six hundred eighty-four million, eight hundred sixty-nine thousand, nine hundred thirteen".