128365632 has 42 divisors (see below), whose sum is σ = 367938558. Its totient is φ = 42788352.

The previous prime is 128365619. The next prime is 128365639. The reversal of 128365632 is 236563821.

It is a happy number.

128365632 is a `hidden beast` number, since 12 + 8 + 3 + 6 + 5 + 632 = 666.

It can be written as a sum of positive squares in only one way, i.e., 109495296 + 18870336 = 10464^2 + 4344^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (128365639) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 110853 + ... + 112004.

Almost surely, 2^128365632 is an apocalyptic number.

128365632 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

128365632 is an abundant number, since it is smaller than the sum of its proper divisors (239572926).

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

128365632 is a wasteful number, since it uses less digits than its factorization.

128365632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222875 (or 222862 counting only the distinct ones).

The product of its digits is 51840, while the sum is 36.

The square root of 128365632 is about 11329.8557801942. The cubic root of 128365632 is about 504.4478257037.

The spelling of 128365632 in words is "one hundred twenty-eight million, three hundred sixty-five thousand, six hundred thirty-two".