685526520 has 64 divisors (see below), whose sum is σ = 2350379520. Its totient is φ = 156691584.

The previous prime is 685526497. The next prime is 685526521. The reversal of 685526520 is 25625586.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685526521) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 407212 + ... + 408891.

It is an arithmetic number, because the mean of its divisors is an integer number (36724680).

Almost surely, 2^685526520 is an apocalyptic number.

685526520 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

685526520 is an abundant number, since it is smaller than the sum of its proper divisors (1664853000).

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

685526520 is a wasteful number, since it uses less digits than its factorization.

685526520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 816124 (or 816120 counting only the distinct ones).

The product of its (nonzero) digits is 144000, while the sum is 39.

The square root of 685526520 is about 26182.5613720278. The cubic root of 685526520 is about 881.7417809408.

The spelling of 685526520 in words is "six hundred eighty-five million, five hundred twenty-six thousand, five hundred twenty".