685620288 has 70 divisors (see below), whose sum is σ = 2032408686. Its totient is φ = 228538368.

The previous prime is 685620259. The next prime is 685620289. The reversal of 685620288 is 882026586.

685620288 is a `hidden beast` number, since 6 + 8 + 562 + 0 + 2 + 88 = 666.

It can be written as a sum of positive squares in only one way, i.e., 675584064 + 10036224 = 25992^2 + 3168^2 .

It is not an unprimeable number, because it can be changed into a prime (685620289) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 60945 + ... + 71312.

Almost surely, 2^685620288 is an apocalyptic number.

It is an amenable number.

685620288 is an abundant number, since it is smaller than the sum of its proper divisors (1346788398).

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

685620288 is a wasteful number, since it uses less digits than its factorization.

685620288 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132281 (or 132262 counting only the distinct ones).

The product of its (nonzero) digits is 368640, while the sum is 45.

The square root of 685620288 is about 26184.3519683035. The cubic root of 685620288 is about 881.7819813762.

The spelling of 685620288 in words is "six hundred eighty-five million, six hundred twenty thousand, two hundred eighty-eight".