686472444 has 144 divisors (see below), whose sum is σ = 2191408128. Its totient is φ = 176546304.

The previous prime is 686472439. The next prime is 686472469. The reversal of 686472444 is 444274686.

It is a self number, because there is not a number n which added to its sum of digits gives 686472444.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 95049 + ... + 102015.

It is an arithmetic number, because the mean of its divisors is an integer number (15218112).

Almost surely, 2^686472444 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 686472444, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1095704064).

686472444 is an abundant number, since it is smaller than the sum of its proper divisors (1504935684).

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

686472444 is a wasteful number, since it uses less digits than its factorization.

686472444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7024 (or 7019 counting only the distinct ones).

The product of its digits is 1032192, while the sum is 45.

The square root of 686472444 is about 26200.6191529895. The cubic root of 686472444 is about 882.1471517789.

The spelling of 686472444 in words is "six hundred eighty-six million, four hundred seventy-two thousand, four hundred forty-four".