685116864 has 336 divisors, whose sum is σ = 2240499456. Its totient is φ = 199065600.

The previous prime is 685116823. The next prime is 685116889. The reversal of 685116864 is 468611586.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 11231394 + ... + 11231454.

Almost surely, 2^685116864 is an apocalyptic number.

685116864 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 685116864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1120249728).

685116864 is an abundant number, since it is smaller than the sum of its proper divisors (1555382592).

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

685116864 is a wasteful number, since it uses less digits than its factorization.

685116864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164 (or 151 counting only the distinct ones).

The product of its digits is 276480, while the sum is 45.

The square root of 685116864 is about 26174.7371333505. The cubic root of 685116864 is about 881.5661092612.

The spelling of 685116864 in words is "six hundred eighty-five million, one hundred sixteen thousand, eight hundred sixty-four".