686632897 has 8 divisors (see below), whose sum is σ = 699573032. Its totient is φ = 673747200.

The previous prime is 686632889. The next prime is 686632927. The reversal of 686632897 is 798236686.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 21818241 + 664814656 = 4671^2 + 25784^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 686632897 - 2³ = 686632889 is a prime.

It is a super-2 number, since 2×686632897² = 942929470485225218, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (686632997) 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, 12313 + ... + 39049.

It is an arithmetic number, because the mean of its divisors is an integer number (87446629).

Almost surely, 2^686632897 is an apocalyptic number.

It is an amenable number.

686632897 is a deficient number, since it is larger than the sum of its proper divisors (12940135).

686632897 is a wasteful number, since it uses less digits than its factorization.

686632897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27219.

The product of its digits is 5225472, while the sum is 55.

The square root of 686632897 is about 26203.6809818773. The cubic root of 686632897 is about 882.2158761352.

The spelling of 686632897 in words is "six hundred eighty-six million, six hundred thirty-two thousand, eight hundred ninety-seven".