120685871990 has 16 divisors (see below), whose sum is σ = 217293332400. Its totient is φ = 48261290400.

The previous prime is 120685871989. The next prime is 120685871993. The reversal of 120685871990 is 99178586021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (120685871993) 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, 1593440 + ... + 1667459.

It is an arithmetic number, because the mean of its divisors is an integer number (13580833275).

Almost surely, 2^120685871990 is an apocalyptic number.

120685871990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

120685871990 is a deficient number, since it is larger than the sum of its proper divisors (96607460410).

120685871990 is a wasteful number, since it uses less digits than its factorization.

120685871990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3264607.

The product of its (nonzero) digits is 2177280, while the sum is 56.

The spelling of 120685871990 in words is "one hundred twenty billion, six hundred eighty-five million, eight hundred seventy-one thousand, nine hundred ninety".