120640681 has 32 divisors (see below), whose sum is σ = 149299200. Its totient is φ = 95257536.

The previous prime is 120640679. The next prime is 120640691. The reversal of 120640681 is 186046021.

It is not a de Polignac number, because 120640681 - 2¹ = 120640679 is a prime.

It is a super-2 number, since 2×120640681² = 29108347824287522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (120640601) 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, 809595 + ... + 809743.

It is an arithmetic number, because the mean of its divisors is an integer number (4665600).

Almost surely, 2^120640681 is an apocalyptic number.

It is an amenable number.

120640681 is a deficient number, since it is larger than the sum of its proper divisors (28658519).

120640681 is a wasteful number, since it uses less digits than its factorization.

120640681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 120640681 is about 10983.6551748496. The cubic root of 120640681 is about 494.1186657289.

The spelling of 120640681 in words is "one hundred twenty million, six hundred forty thousand, six hundred eighty-one".