685510420 has 24 divisors (see below), whose sum is σ = 1645225344. Its totient is φ = 235032096.

The previous prime is 685510417. The next prime is 685510421. The reversal of 685510420 is 24015586.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685510421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2448112 + ... + 2448391.

It is an arithmetic number, because the mean of its divisors is an integer number (68551056).

Almost surely, 2^685510420 is an apocalyptic number.

It is an amenable number.

685510420 is an abundant number, since it is smaller than the sum of its proper divisors (959714924).

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

685510420 is a wasteful number, since it uses less digits than its factorization.

685510420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4896519 (or 4896517 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 31.

The square root of 685510420 is about 26182.2539136721. The cubic root of 685510420 is about 881.7348781425.

The spelling of 685510420 in words is "six hundred eighty-five million, five hundred ten thousand, four hundred twenty".