685834240 has 272 divisors, whose sum is σ = 2113913088. Its totient is φ = 207618048.

The previous prime is 685834223. The next prime is 685834249. The reversal of 685834240 is 42438586.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 685834193 and 685834202.

It is not an unprimeable number, because it can be changed into a prime (685834249) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29818869 + ... + 29818891.

Almost surely, 2^685834240 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 685834240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1056956544).

685834240 is an abundant number, since it is smaller than the sum of its proper divisors (1428078848).

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

685834240 is an equidigital number, since it uses as much as digits as its factorization.

685834240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80 (or 50 counting only the distinct ones).

The product of its (nonzero) digits is 184320, while the sum is 40.

The square root of 685834240 is about 26188.4371431363. The cubic root of 685834240 is about 881.8736936554.

The spelling of 685834240 in words is "six hundred eighty-five million, eight hundred thirty-four thousand, two hundred forty".