128264688 has 40 divisors (see below), whose sum is σ = 368168400. Its totient is φ = 42754752.

The previous prime is 128264683. The next prime is 128264707. The reversal of 128264688 is 886462821.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128264683) 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, 148023 + ... + 148886.

It is an arithmetic number, because the mean of its divisors is an integer number (9204210).

Almost surely, 2^128264688 is an apocalyptic number.

128264688 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

128264688 is an abundant number, since it is smaller than the sum of its proper divisors (239903712).

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

128264688 is a wasteful number, since it uses less digits than its factorization.

128264688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 296926 (or 296914 counting only the distinct ones).

The product of its digits is 294912, while the sum is 45.

The square root of 128264688 is about 11325.4001253819. The cubic root of 128264688 is about 504.3155620178.

The spelling of 128264688 in words is "one hundred twenty-eight million, two hundred sixty-four thousand, six hundred eighty-eight".