685442304 has 144 divisors (see below), whose sum is σ = 2045144640. Its totient is φ = 226437120.

The previous prime is 685442291. The next prime is 685442323. The reversal of 685442304 is 403244586.

It is a tau number, because it is divible by the number of its divisors (144).

It is a super-2 number, since 2×685442304² = 939662304225656832, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent 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, 905094 + ... + 905850.

Almost surely, 2^685442304 is an apocalyptic number.

685442304 is a gapful number since it is divisible by the number (64) 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 685442304, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1022572320).

685442304 is an abundant number, since it is smaller than the sum of its proper divisors (1359702336).

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

685442304 is a wasteful number, since it uses less digits than its factorization.

685442304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 913 (or 893 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 36.

The square root of 685442304 is about 26180.9530766166. The cubic root of 685442304 is about 881.7056725362.

The spelling of 685442304 in words is "six hundred eighty-five million, four hundred forty-two thousand, three hundred four".