685299888 has 360 divisors, whose sum is σ = 2490423936. Its totient is φ = 174182400.

The previous prime is 685299887. The next prime is 685299929. The reversal of 685299888 is 888992586.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (685299887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 2843448 + ... + 2843688.

Almost surely, 2^685299888 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 685299888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1245211968).

685299888 is an abundant number, since it is smaller than the sum of its proper divisors (1805124048).

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

685299888 is a wasteful number, since it uses less digits than its factorization.

685299888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 313 (or 297 counting only the distinct ones).

The product of its digits is 19906560, while the sum is 63.

The square root of 685299888 is about 26178.2330954555. The cubic root of 685299888 is about 881.6446036021.

The spelling of 685299888 in words is "six hundred eighty-five million, two hundred ninety-nine thousand, eight hundred eighty-eight".