128272664 has 32 divisors (see below), whose sum is σ = 259518000. Its totient is φ = 59087232.

The previous prime is 128272663. The next prime is 128272681. The reversal of 128272664 is 466272821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128272663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76022 + ... + 77690.

Almost surely, 2^128272664 is an apocalyptic number.

It is an amenable number.

128272664 is an abundant number, since it is smaller than the sum of its proper divisors (131245336).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

128272664 is a wasteful number, since it uses less digits than its factorization.

128272664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2427 (or 2423 counting only the distinct ones).

The product of its digits is 64512, while the sum is 38.

The square root of 128272664 is about 11325.7522487471. The cubic root of 128272664 is about 504.3260152392.

The spelling of 128272664 in words is "one hundred twenty-eight million, two hundred seventy-two thousand, six hundred sixty-four".