686472556 has 72 divisors (see below), whose sum is σ = 1573834752. Its totient is φ = 258804000.

The previous prime is 686472547. The next prime is 686472593. The reversal of 686472556 is 655274686.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 61701 + ... + 71971.

It is an arithmetic number, because the mean of its divisors is an integer number (21858816).

Almost surely, 2^686472556 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 686472556, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (786917376).

686472556 is an abundant number, since it is smaller than the sum of its proper divisors (887362196).

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

686472556 is a wasteful number, since it uses less digits than its factorization.

686472556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10331 (or 10322 counting only the distinct ones).

The product of its digits is 2419200, while the sum is 49.

The square root of 686472556 is about 26200.6212903435. The cubic root of 686472556 is about 882.1471997538.

The spelling of 686472556 in words is "six hundred eighty-six million, four hundred seventy-two thousand, five hundred fifty-six".