686621634 has 16 divisors (see below), whose sum is σ = 1386840960. Its totient is φ = 226607600.

The previous prime is 686621623. The next prime is 686621647. The reversal of 686621634 is 436126686.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 565914 + ... + 567125.

It is an arithmetic number, because the mean of its divisors is an integer number (86677560).

Almost surely, 2^686621634 is an apocalyptic number.

686621634 is an abundant number, since it is smaller than the sum of its proper divisors (700219326).

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

686621634 is a wasteful number, since it uses less digits than its factorization.

686621634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1133145.

The product of its digits is 248832, while the sum is 42.

The square root of 686621634 is about 26203.4660684422. The cubic root of 686621634 is about 882.2110523777.

The spelling of 686621634 in words is "six hundred eighty-six million, six hundred twenty-one thousand, six hundred thirty-four".