685181952 has 528 divisors, whose sum is σ = 2622780160. Its totient is φ = 167215104.

The previous prime is 685181929. The next prime is 685181989. The reversal of 685181952 is 259181586.

It is a happy number.

Its product of digits (172800) is a multiple of the sum of its prime factors (108).

It is a junction number, because it is equal to n+sod(n) for n = 685181898 and 685181907.

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, 15934443 + ... + 15934485.

Almost surely, 2^685181952 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 685181952, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1311390080).

685181952 is an abundant number, since it is smaller than the sum of its proper divisors (1937598208).

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

685181952 is a wasteful number, since it uses less digits than its factorization.

685181952 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108 (or 87 counting only the distinct ones).

The product of its digits is 172800, while the sum is 45.

The square root of 685181952 is about 26175.9804400905. The cubic root of 685181952 is about 881.5940254513.

The spelling of 685181952 in words is "six hundred eighty-five million, one hundred eighty-one thousand, nine hundred fifty-two".