128632818 has 16 divisors (see below), whose sum is σ = 257550336. Its totient is φ = 42830160.

The previous prime is 128632811. The next prime is 128632873. The reversal of 128632818 is 818236821.

It is a super-2 number, since 2×128632818² = 33092803733242248, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (128632811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5746 + ... + 17037.

It is an arithmetic number, because the mean of its divisors is an integer number (16096896).

Almost surely, 2^128632818 is an apocalyptic number.

128632818 is an abundant number, since it is smaller than the sum of its proper divisors (128917518).

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

128632818 is a wasteful number, since it uses less digits than its factorization.

128632818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23729.

The product of its digits is 36864, while the sum is 39.

The square root of 128632818 is about 11341.6408865737. The cubic root of 128632818 is about 504.7975766178.

The spelling of 128632818 in words is "one hundred twenty-eight million, six hundred thirty-two thousand, eight hundred eighteen".