685140890 has 16 divisors (see below), whose sum is σ = 1409432832. Its totient is φ = 234905424.

The previous prime is 685140871. The next prime is 685140899. The reversal of 685140890 is 98041586.

It is not an unprimeable number, because it can be changed into a prime (685140899) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4893794 + ... + 4893933.

It is an arithmetic number, because the mean of its divisors is an integer number (88089552).

Almost surely, 2^685140890 is an apocalyptic number.

685140890 is an abundant number, since it is smaller than the sum of its proper divisors (724291942).

685140890 is a wasteful number, since it uses less digits than its factorization.

685140890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9787741.

The product of its (nonzero) digits is 69120, while the sum is 41.

The square root of 685140890 is about 26175.1960833152. The cubic root of 685140890 is about 881.5764141988.

The spelling of 685140890 in words is "six hundred eighty-five million, one hundred forty thousand, eight hundred ninety".