686129748 has 24 divisors (see below), whose sum is σ = 1685231520. Its totient is φ = 216672480.

The previous prime is 686129737. The next prime is 686129749. The reversal of 686129748 is 847921686.

It is a self number, because there is not a number n which added to its sum of digits gives 686129748.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686129749) 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, 1504443 + ... + 1504898.

It is an arithmetic number, because the mean of its divisors is an integer number (70217980).

Almost surely, 2^686129748 is an apocalyptic number.

It is an amenable number.

686129748 is an abundant number, since it is smaller than the sum of its proper divisors (999101772).

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

686129748 is a wasteful number, since it uses less digits than its factorization.

686129748 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3009367 (or 3009365 counting only the distinct ones).

The product of its digits is 1161216, while the sum is 51.

The square root of 686129748 is about 26194.0784911399. The cubic root of 686129748 is about 882.0003342228. Note that the first 3 decimals are identical.

The spelling of 686129748 in words is "six hundred eighty-six million, one hundred twenty-nine thousand, seven hundred forty-eight".