686968445 has 4 divisors (see below), whose sum is σ = 824362140. Its totient is φ = 549574752.

The previous prime is 686968433. The next prime is 686968537. The reversal of 686968445 is 544869686.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 434889316 + 252079129 = 20854^2 + 15877^2 .

It is a cyclic number.

It is not a de Polignac number, because 686968445 - 2¹⁴ = 686952061 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68696840 + ... + 68696849.

It is an arithmetic number, because the mean of its divisors is an integer number (206090535).

Almost surely, 2^686968445 is an apocalyptic number.

It is an amenable number.

686968445 is a deficient number, since it is larger than the sum of its proper divisors (137393695).

686968445 is a wasteful number, since it uses less digits than its factorization.

686968445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137393694.

The product of its digits is 9953280, while the sum is 56.

The square root of 686968445 is about 26210.0828880795. The cubic root of 686968445 is about 882.3595616309.

The spelling of 686968445 in words is "six hundred eighty-six million, nine hundred sixty-eight thousand, four hundred forty-five".