686448040 has 16 divisors (see below), whose sum is σ = 1544508180. Its totient is φ = 274579200.

The previous prime is 686448029. The next prime is 686448047. The reversal of 686448040 is 40844686.

686448040 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 646074724 + 40373316 = 25418^2 + 6354^2 .

It is a Harshad number since it is a multiple of its sum of digits (40), and also a Moran number because the ratio is a prime number: 17161201 = 686448040 / (6 + 8 + 6 + 4 + 4 + 8 + 0 + 4 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 686447984 and 686448002.

It is not an unprimeable number, because it can be changed into a prime (686448047) 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, 8580561 + ... + 8580640.

Almost surely, 2^686448040 is an apocalyptic number.

It is an amenable number.

686448040 is an abundant number, since it is smaller than the sum of its proper divisors (858060140).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

686448040 is a wasteful number, since it uses less digits than its factorization.

686448040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17161212 (or 17161208 counting only the distinct ones).

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

The square root of 686448040 is about 26200.1534346652. The cubic root of 686448040 is about 882.1366982521.

The spelling of 686448040 in words is "six hundred eighty-six million, four hundred forty-eight thousand, forty".