128743984 has 20 divisors (see below), whose sum is σ = 253166584. Its totient is φ = 63410688.

The previous prime is 128743973. The next prime is 128743991. The reversal of 128743984 is 489347821.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 58977 + ... + 61120.

Almost surely, 2^128743984 is an apocalyptic number.

It is an amenable number.

128743984 is a deficient number, since it is larger than the sum of its proper divisors (124422600).

128743984 is a wasteful number, since it uses less digits than its factorization.

128743984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120172 (or 120166 counting only the distinct ones).

The product of its digits is 387072, while the sum is 46.

The square root of 128743984 is about 11346.5406181796. The cubic root of 128743984 is about 504.9429520892.

The spelling of 128743984 in words is "one hundred twenty-eight million, seven hundred forty-three thousand, nine hundred eighty-four".