120781988 has 6 divisors (see below), whose sum is σ = 211368486. Its totient is φ = 60390992.

The previous prime is 120781987. The next prime is 120782009. The reversal of 120781988 is 889187021.

It can be written as a sum of positive squares in only one way, i.e., 102050404 + 18731584 = 10102^2 + 4328^2 .

It is not an unprimeable number, because it can be changed into a prime (120781987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15097745 + ... + 15097752.

It is an arithmetic number, because the mean of its divisors is an integer number (35228081).

Almost surely, 2^120781988 is an apocalyptic number.

It is an amenable number.

120781988 is a deficient number, since it is larger than the sum of its proper divisors (90586498).

120781988 is a wasteful number, since it uses less digits than its factorization.

120781988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30195501 (or 30195499 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 44.

The square root of 120781988 is about 10990.0858959337. The cubic root of 120781988 is about 494.3115116311.

The spelling of 120781988 in words is "one hundred twenty million, seven hundred eighty-one thousand, nine hundred eighty-eight".