685372388 has 24 divisors (see below), whose sum is σ = 1206152640. Its totient is φ = 340764320.

The previous prime is 685372381. The next prime is 685372411. The reversal of 685372388 is 883273586.

It is not an unprimeable number, because it can be changed into a prime (685372381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 816473 + ... + 817311.

It is an arithmetic number, because the mean of its divisors is an integer number (50256360).

Almost surely, 2^685372388 is an apocalyptic number.

It is an amenable number.

685372388 is a deficient number, since it is larger than the sum of its proper divisors (520780252).

685372388 is a wasteful number, since it uses less digits than its factorization.

685372388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1747 (or 1745 counting only the distinct ones).

The product of its digits is 1935360, while the sum is 50.

The square root of 685372388 is about 26179.6177970573. The cubic root of 685372388 is about 881.6756931445.

The spelling of 685372388 in words is "six hundred eighty-five million, three hundred seventy-two thousand, three hundred eighty-eight".