686635380 has 72 divisors (see below), whose sum is σ = 2159949792. Its totient is φ = 183101472.

The previous prime is 686635351. The next prime is 686635387. The reversal of 686635380 is 83536686.

686635380 is a `hidden beast` number, since 6 + 8 + 6 + 635 + 3 + 8 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686635387) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 65782 + ... + 75501.

Almost surely, 2^686635380 is an apocalyptic number.

686635380 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

686635380 is an abundant number, since it is smaller than the sum of its proper divisors (1473314412).

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

686635380 is a wasteful number, since it uses less digits than its factorization.

686635380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141307 (or 141293 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 45.

The square root of 686635380 is about 26203.7283606742. The cubic root of 686635380 is about 882.2169395561.

The spelling of 686635380 in words is "six hundred eighty-six million, six hundred thirty-five thousand, three hundred eighty".