686490044 has 6 divisors (see below), whose sum is σ = 1201357584. Its totient is φ = 343245020.

The previous prime is 686490041. The next prime is 686490053. The reversal of 686490044 is 440094686.

It is a super-2 number, since 2×686490044² = 942537161022243872, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 686489983 and 686490010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686490041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85811252 + ... + 85811259.

It is an arithmetic number, because the mean of its divisors is an integer number (200226264).

Almost surely, 2^686490044 is an apocalyptic number.

It is an amenable number.

686490044 is a deficient number, since it is larger than the sum of its proper divisors (514867540).

686490044 is a wasteful number, since it uses less digits than its factorization.

686490044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171622515 (or 171622513 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 41.

The square root of 686490044 is about 26200.9550207621. The cubic root of 686490044 is about 882.1546906380.

The spelling of 686490044 in words is "six hundred eighty-six million, four hundred ninety thousand, forty-four".