685543040 has 256 divisors, whose sum is σ = 2056320000. Its totient is φ = 212779008.

The previous prime is 685543031. The next prime is 685543069. The reversal of 685543040 is 40345586.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4600886 + ... + 4601034.

It is an arithmetic number, because the mean of its divisors is an integer number (8032500).

Almost surely, 2^685543040 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 685543040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1028160000).

685543040 is an abundant number, since it is smaller than the sum of its proper divisors (1370776960).

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

685543040 is a wasteful number, since it uses less digits than its factorization.

685543040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 267 (or 255 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 35.

The square root of 685543040 is about 26182.8768472832. The cubic root of 685543040 is about 881.7488636997.

The spelling of 685543040 in words is "six hundred eighty-five million, five hundred forty-three thousand, forty".