128532440 has 32 divisors (see below), whose sum is σ = 289926000. Its totient is φ = 51283584.

The previous prime is 128532431. The next prime is 128532493. The reversal of 128532440 is 44235821.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

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, 12926 + ... + 20594.

Almost surely, 2^128532440 is an apocalyptic number.

128532440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128532440 is an abundant number, since it is smaller than the sum of its proper divisors (161393560).

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

128532440 is a wasteful number, since it uses less digits than its factorization.

128532440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8099 (or 8095 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 29.

The square root of 128532440 is about 11337.2148255204. The cubic root of 128532440 is about 504.6662369958. Note that the first 3 decimals are identical.

The spelling of 128532440 in words is "one hundred twenty-eight million, five hundred thirty-two thousand, four hundred forty".