686838132 has 36 divisors (see below), whose sum is σ = 1737195460. Its totient is φ = 228811392.

The previous prime is 686838083. The next prime is 686838133. The reversal of 686838132 is 231838686.

It can be written as a sum of positive squares in 2 ways, for example, as 578594916 + 108243216 = 24054^2 + 10404^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686838133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 70638 + ... + 79770.

Almost surely, 2^686838132 is an apocalyptic number.

It is an amenable number.

686838132 is an abundant number, since it is smaller than the sum of its proper divisors (1050357328).

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

686838132 is a wasteful number, since it uses less digits than its factorization.

686838132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11232 (or 11227 counting only the distinct ones).

The product of its digits is 331776, while the sum is 45.

The square root of 686838132 is about 26207.5968375584. The cubic root of 686838132 is about 882.3037656704.

The spelling of 686838132 in words is "six hundred eighty-six million, eight hundred thirty-eight thousand, one hundred thirty-two".