686620826 has 16 divisors (see below), whose sum is σ = 1043890848. Its totient is φ = 338682000.

The previous prime is 686620807. The next prime is 686620843. The reversal of 686620826 is 628026686.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51161 + ... + 63171.

It is an arithmetic number, because the mean of its divisors is an integer number (65243178).

Almost surely, 2^686620826 is an apocalyptic number.

686620826 is a deficient number, since it is larger than the sum of its proper divisors (357270022).

686620826 is a wasteful number, since it uses less digits than its factorization.

686620826 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12397.

The product of its (nonzero) digits is 331776, while the sum is 44.

The square root of 686620826 is about 26203.4506506300. The cubic root of 686620826 is about 882.2107063225.

The spelling of 686620826 in words is "six hundred eighty-six million, six hundred twenty thousand, eight hundred twenty-six".