686087944 has 16 divisors (see below), whose sum is σ = 1298905920. Its totient is φ = 339713040.

The previous prime is 686087881. The next prime is 686087947. The reversal of 686087944 is 449780686.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 686087891 and 686087900.

It is not an unprimeable number, because it can be changed into a prime (686087947) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 415492 + ... + 417139.

It is an arithmetic number, because the mean of its divisors is an integer number (81181620).

Almost surely, 2^686087944 is an apocalyptic number.

It is an amenable number.

686087944 is a deficient number, since it is larger than the sum of its proper divisors (612817976).

686087944 is a wasteful number, since it uses less digits than its factorization.

686087944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 832740 (or 832736 counting only the distinct ones).

The product of its (nonzero) digits is 2322432, while the sum is 52.

The square root of 686087944 is about 26193.2805123757. The cubic root of 686087944 is about 881.9824212401.

The spelling of 686087944 in words is "six hundred eighty-six million, eighty-seven thousand, nine hundred forty-four".