686812361 has 16 divisors (see below), whose sum is σ = 772813440. Its totient is φ = 607178880.

The previous prime is 686812351. The next prime is 686812367. The reversal of 686812361 is 163218686.

It is a cyclic number.

It is not a de Polignac number, because 686812361 - 2¹⁰ = 686811337 is a prime.

It is a super-2 number, since 2×686812361² = 943422438444788642, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (686812367) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1250 + ... + 37083.

It is an arithmetic number, because the mean of its divisors is an integer number (48300840).

Almost surely, 2^686812361 is an apocalyptic number.

It is an amenable number.

686812361 is a deficient number, since it is larger than the sum of its proper divisors (86001079).

686812361 is a wasteful number, since it uses less digits than its factorization.

686812361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38416.

The product of its digits is 82944, while the sum is 41.

The square root of 686812361 is about 26207.1051625318. The cubic root of 686812361 is about 882.2927304964.

The spelling of 686812361 in words is "six hundred eighty-six million, eight hundred twelve thousand, three hundred sixty-one".