681864970 has 16 divisors (see below), whose sum is σ = 1291955040. Its totient is φ = 258390864.

The previous prime is 681864941. The next prime is 681864979. The reversal of 681864970 is 79468186.

It is not an unprimeable number, because it can be changed into a prime (681864979) 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 7 ways as a sum of consecutive naturals, for example, 1794192 + ... + 1794571.

It is an arithmetic number, because the mean of its divisors is an integer number (80747190).

Almost surely, 2^681864970 is an apocalyptic number.

681864970 is a deficient number, since it is larger than the sum of its proper divisors (610090070).

681864970 is a wasteful number, since it uses less digits than its factorization.

681864970 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3588789.

The product of its (nonzero) digits is 580608, while the sum is 49.

The square root of 681864970 is about 26112.5443034569. The cubic root of 681864970 is about 880.1691178069.

The spelling of 681864970 in words is "six hundred eighty-one million, eight hundred sixty-four thousand, nine hundred seventy".