686244028 has 12 divisors (see below), whose sum is σ = 1211555520. Its totient is φ = 340085312.

The previous prime is 686243969. The next prime is 686244029. The reversal of 686244028 is 820442686.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686244029) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 758668 + ... + 759571.

It is an arithmetic number, because the mean of its divisors is an integer number (100962960).

Almost surely, 2^686244028 is an apocalyptic number.

It is an amenable number.

686244028 is a deficient number, since it is larger than the sum of its proper divisors (525311492).

686244028 is a wasteful number, since it uses less digits than its factorization.

686244028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1518356 (or 1518354 counting only the distinct ones).

The product of its (nonzero) digits is 147456, while the sum is 40.

The square root of 686244028 is about 26196.2598093697. The cubic root of 686244028 is about 882.0492994041.

The spelling of 686244028 in words is "six hundred eighty-six million, two hundred forty-four thousand, twenty-eight".