128647972 has 6 divisors (see below), whose sum is σ = 225133958. Its totient is φ = 64323984.

The previous prime is 128647957. The next prime is 128647979. The reversal of 128647972 is 279746821.

It can be written as a sum of positive squares in only one way, i.e., 78747876 + 49900096 = 8874^2 + 7064^2 .

It is not an unprimeable number, because it can be changed into a prime (128647979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16080993 + ... + 16081000.

Almost surely, 2^128647972 is an apocalyptic number.

It is an amenable number.

128647972 is a deficient number, since it is larger than the sum of its proper divisors (96485986).

128647972 is a wasteful number, since it uses less digits than its factorization.

128647972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32161997 (or 32161995 counting only the distinct ones).

The product of its digits is 338688, while the sum is 46.

The square root of 128647972 is about 11342.3089360147. The cubic root of 128647972 is about 504.8173989363.

The spelling of 128647972 in words is "one hundred twenty-eight million, six hundred forty-seven thousand, nine hundred seventy-two".