686569338 has 128 divisors (see below), whose sum is σ = 1938800640. Its totient is φ = 175193280.

The previous prime is 686569337. The next prime is 686569339. The reversal of 686569338 is 833965686.

It is an interprime number because it is at equal distance from previous prime (686569337) and next prime (686569339).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (686569337) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 150081 + ... + 154587.

It is an arithmetic number, because the mean of its divisors is an integer number (15146880).

Almost surely, 2^686569338 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 686569338, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (969400320).

686569338 is an abundant number, since it is smaller than the sum of its proper divisors (1252231302).

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

686569338 is a wasteful number, since it uses less digits than its factorization.

686569338 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4569 (or 4563 counting only the distinct ones).

The product of its digits is 5598720, while the sum is 54.

The square root of 686569338 is about 26202.4681661862. The cubic root of 686569338 is about 882.1886541706.

The spelling of 686569338 in words is "six hundred eighty-six million, five hundred sixty-nine thousand, three hundred thirty-eight".