128743988 has 6 divisors (see below), whose sum is σ = 225301986. Its totient is φ = 64371992.

The previous prime is 128743973. The next prime is 128743991. The reversal of 128743988 is 889347821.

It can be written as a sum of positive squares in only one way, i.e., 70190884 + 58553104 = 8378^2 + 7652^2 .

It is a super-2 number, since 2×128743988² = 33150028892288288, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16092995 + ... + 16093002.

It is an arithmetic number, because the mean of its divisors is an integer number (37550331).

Almost surely, 2^128743988 is an apocalyptic number.

It is an amenable number.

128743988 is a deficient number, since it is larger than the sum of its proper divisors (96557998).

128743988 is a wasteful number, since it uses less digits than its factorization.

128743988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32186001 (or 32185999 counting only the distinct ones).

The product of its digits is 774144, while the sum is 50.

The square root of 128743988 is about 11346.5407944448. The cubic root of 128743988 is about 504.9429573187.

The spelling of 128743988 in words is "one hundred twenty-eight million, seven hundred forty-three thousand, nine hundred eighty-eight".