680989785 has 32 divisors (see below), whose sum is σ = 1250767872. Its totient is φ = 309927360.

The previous prime is 680989783. The next prime is 680989807. The reversal of 680989785 is 587989086.

It is a happy number.

It is not a de Polignac number, because 680989785 - 2¹ = 680989783 is a prime.

It is not an unprimeable number, because it can be changed into a prime (680989781) 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 31 ways as a sum of consecutive naturals, for example, 9550 + ... + 38120.

It is an arithmetic number, because the mean of its divisors is an integer number (39086496).

Almost surely, 2^680989785 is an apocalyptic number.

It is an amenable number.

680989785 is a deficient number, since it is larger than the sum of its proper divisors (569778087).

680989785 is a wasteful number, since it uses less digits than its factorization.

680989785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28813.

The product of its (nonzero) digits is 8709120, while the sum is 60.

The square root of 680989785 is about 26095.7809808406. The cubic root of 680989785 is about 879.7923860260.

The spelling of 680989785 in words is "six hundred eighty million, nine hundred eighty-nine thousand, seven hundred eighty-five".