685401892 has 48 divisors (see below), whose sum is σ = 1421925120. Its totient is φ = 282844800.

The previous prime is 685401889. The next prime is 685401907. The reversal of 685401892 is 298104586.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 373417 + ... + 375247.

It is an arithmetic number, because the mean of its divisors is an integer number (29623440).

Almost surely, 2^685401892 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 685401892, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (710962560).

685401892 is an abundant number, since it is smaller than the sum of its proper divisors (736523228).

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

685401892 is a wasteful number, since it uses less digits than its factorization.

685401892 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2332 (or 2330 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 43.

The square root of 685401892 is about 26180.1812827948. The cubic root of 685401892 is about 881.6883444597.

The spelling of 685401892 in words is "six hundred eighty-five million, four hundred one thousand, eight hundred ninety-two".