686122272 has 144 divisors (see below), whose sum is σ = 2199990240. Its totient is φ = 207884160.

The previous prime is 686122247. The next prime is 686122273. The reversal of 686122272 is 272221686.

It is a tau number, because it is divible by the number of its divisors (144).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (686122273) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 101263 + ... + 107825.

It is an arithmetic number, because the mean of its divisors is an integer number (15277710).

Almost surely, 2^686122272 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 686122272, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1099995120).

686122272 is an abundant number, since it is smaller than the sum of its proper divisors (1513867968).

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

686122272 is a wasteful number, since it uses less digits than its factorization.

686122272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6604 (or 6579 counting only the distinct ones).

The product of its digits is 32256, while the sum is 36.

The square root of 686122272 is about 26193.9357867427. The cubic root of 686122272 is about 881.9971308158.

The spelling of 686122272 in words is "six hundred eighty-six million, one hundred twenty-two thousand, two hundred seventy-two".