686968444 has 6 divisors (see below), whose sum is σ = 1202194784. Its totient is φ = 343484220.

The previous prime is 686968433. The next prime is 686968537. The reversal of 686968444 is 444869686.

It is a happy number.

It is a super-2 number, since 2×686968444² = 943851286103562272, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85871052 + ... + 85871059.

Almost surely, 2^686968444 is an apocalyptic number.

It is an amenable number.

686968444 is a deficient number, since it is larger than the sum of its proper divisors (515226340).

686968444 is a wasteful number, since it uses less digits than its factorization.

686968444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171742115 (or 171742113 counting only the distinct ones).

The product of its digits is 7962624, while the sum is 55.

The square root of 686968444 is about 26210.0828690029. The cubic root of 686968444 is about 882.3595612028.

The spelling of 686968444 in words is "six hundred eighty-six million, nine hundred sixty-eight thousand, four hundred forty-four".