685044500 has 72 divisors (see below), whose sum is σ = 1740466728. Its totient is φ = 234864000.

The previous prime is 685044497. The next prime is 685044517. The reversal of 685044500 is 5440586.

685044500 = T₃₂₄₈ + T₃₂₄₉ + ... + T₃₃₇₂.

It can be written as a sum of positive squares in 4 ways, for example, as 82047364 + 602997136 = 9058^2 + 24556^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10520 + ... + 38480.

It is an arithmetic number, because the mean of its divisors is an integer number (24173149).

Almost surely, 2^685044500 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 685044500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (870233364).

685044500 is an abundant number, since it is smaller than the sum of its proper divisors (1055422228).

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

685044500 is a wasteful number, since it uses less digits than its factorization.

685044500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27994 (or 27975 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 32.

The square root of 685044500 is about 26173.3547715993. The cubic root of 685044500 is about 881.5350703249.

The spelling of 685044500 in words is "six hundred eighty-five million, forty-four thousand, five hundred".