128719972 has 6 divisors (see below), whose sum is σ = 225259958. Its totient is φ = 64359984.

The previous prime is 128719939. The next prime is 128719973. The reversal of 128719972 is 279917821.

It can be written as a sum of positive squares in only one way, i.e., 92044836 + 36675136 = 9594^2 + 6056^2 .

It is not an unprimeable number, because it can be changed into a prime (128719973) 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 as a sum of consecutive naturals, namely, 16089993 + ... + 16090000.

Almost surely, 2^128719972 is an apocalyptic number.

It is an amenable number.

128719972 is a deficient number, since it is larger than the sum of its proper divisors (96539986).

128719972 is a wasteful number, since it uses less digits than its factorization.

128719972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32179997 (or 32179995 counting only the distinct ones).

The product of its digits is 127008, while the sum is 46.

The square root of 128719972 is about 11345.4824489750. The cubic root of 128719972 is about 504.9115578869.

The spelling of 128719972 in words is "one hundred twenty-eight million, seven hundred nineteen thousand, nine hundred seventy-two".