686544634 has 8 divisors (see below), whose sum is σ = 1031573088. Its totient is φ = 342686940.

The previous prime is 686544619. The next prime is 686544647. The reversal of 686544634 is 436445686.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 291222 + ... + 293569.

It is an arithmetic number, because the mean of its divisors is an integer number (128946636).

Almost surely, 2^686544634 is an apocalyptic number.

686544634 is a deficient number, since it is larger than the sum of its proper divisors (345028454).

686544634 is a wasteful number, since it uses less digits than its factorization.

686544634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 585380.

The product of its digits is 1658880, while the sum is 46.

The square root of 686544634 is about 26201.9967559726. The cubic root of 686544634 is about 882.1780731321.

The spelling of 686544634 in words is "six hundred eighty-six million, five hundred forty-four thousand, six hundred thirty-four".