685232308440 has 384 divisors, whose sum is σ = 2384648735040. Its totient is φ = 170371289088.

The previous prime is 685232308421. The next prime is 685232308451. The reversal of 685232308440 is 44803232586.

685232308440 is a `hidden beast` number, since 6 + 8 + 523 + 2 + 3 + 0 + 84 + 40 = 666.

It is a super-2 number, since 2×685232308440² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 30344994 + ... + 30367566.

Almost surely, 2^685232308440 is an apocalyptic number.

685232308440 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 685232308440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1192324367520).

685232308440 is an abundant number, since it is smaller than the sum of its proper divisors (1699416426600).

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

685232308440 is a wasteful number, since it uses less digits than its factorization.

685232308440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22723 (or 22716 counting only the distinct ones).

The product of its (nonzero) digits is 1105920, while the sum is 45.

The spelling of 685232308440 in words is "six hundred eighty-five billion, two hundred thirty-two million, three hundred eight thousand, four hundred forty".