684971138862 has 24 divisors (see below), whose sum is σ = 1492990991856. Its totient is φ = 226956504096.

The previous prime is 684971138801. The next prime is 684971138869. The reversal of 684971138862 is 268831179486.

684971138862 is a `hidden beast` number, since 6 + 8 + 497 + 1 + 1 + 3 + 88 + 62 = 666.

It is a super-2 number, since 2×684971138862² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 684971138862.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (684971138869) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 113930983 + ... + 113936994.

It is an arithmetic number, because the mean of its divisors is an integer number (62207957994).

Almost surely, 2^684971138862 is an apocalyptic number.

684971138862 is an abundant number, since it is smaller than the sum of its proper divisors (808019852994).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

684971138862 is a wasteful number, since it uses less digits than its factorization.

684971138862 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227868152 (or 227868149 counting only the distinct ones).

The product of its digits is 27869184, while the sum is 63.

The spelling of 684971138862 in words is "six hundred eighty-four billion, nine hundred seventy-one million, one hundred thirty-eight thousand, eight hundred sixty-two".