686569440 has 96 divisors (see below), whose sum is σ = 2168843040. Its totient is φ = 182564864.

The previous prime is 686569423. The next prime is 686569441. The reversal of 686569440 is 44965686.

It is a happy number.

686569440 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 686569440.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686569441) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 184882 + ... + 188558.

It is an arithmetic number, because the mean of its divisors is an integer number (22592115).

Almost surely, 2^686569440 is an apocalyptic number.

686569440 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 686569440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1084421520).

686569440 is an abundant number, since it is smaller than the sum of its proper divisors (1482273600).

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

686569440 is a wasteful number, since it uses less digits than its factorization.

686569440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4084 (or 4076 counting only the distinct ones).

The product of its (nonzero) digits is 1244160, while the sum is 48.

The square root of 686569440 is about 26202.4701125676. The cubic root of 686569440 is about 882.1886978580.

The spelling of 686569440 in words is "six hundred eighty-six million, five hundred sixty-nine thousand, four hundred forty".