685752220 has 12 divisors (see below), whose sum is σ = 1440079704. Its totient is φ = 274300880.

The previous prime is 685752203. The next prime is 685752227. The reversal of 685752220 is 22257586.

It is a super-2 number, since 2×685752220² = 940512214469856800, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 685752220.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685752227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17143786 + ... + 17143825.

It is an arithmetic number, because the mean of its divisors is an integer number (120006642).

Almost surely, 2^685752220 is an apocalyptic number.

It is an amenable number.

685752220 is an abundant number, since it is smaller than the sum of its proper divisors (754327484).

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

685752220 is a wasteful number, since it uses less digits than its factorization.

685752220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34287620 (or 34287618 counting only the distinct ones).

The product of its (nonzero) digits is 67200, while the sum is 37.

The square root of 685752220 is about 26186.8711380340. The cubic root of 685752220 is about 881.8385373646.

The spelling of 685752220 in words is "six hundred eighty-five million, seven hundred fifty-two thousand, two hundred twenty".