685333440 has 224 divisors, whose sum is σ = 2637861120. Its totient is φ = 166118400.

The previous prime is 685333433. The next prime is 685333463. The reversal of 685333440 is 44333586.

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

It is a junction number, because it is equal to n+sod(n) for n = 685333395 and 685333404.

It is a congruent number.

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, 91435 + ... + 98645.

Almost surely, 2^685333440 is an apocalyptic number.

685333440 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 685333440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1318930560).

685333440 is an abundant number, since it is smaller than the sum of its proper divisors (1952527680).

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

685333440 is a wasteful number, since it uses less digits than its factorization.

685333440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7248 (or 7232 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 36.

The square root of 685333440 is about 26178.8739253620. The cubic root of 685333440 is about 881.6589916860.

The spelling of 685333440 in words is "six hundred eighty-five million, three hundred thirty-three thousand, four hundred forty".