128732156 has 12 divisors (see below), whose sum is σ = 257464368. Its totient is φ = 55170912.

The previous prime is 128732141. The next prime is 128732171. The reversal of 128732156 is 651237821.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (128732141) and next prime (128732171).

128732156 is an admirable 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 3 ways as a sum of consecutive naturals, for example, 2298761 + ... + 2298816.

It is an arithmetic number, because the mean of its divisors is an integer number (21455364).

Almost surely, 2^128732156 is an apocalyptic number.

It is an amenable number.

128732156 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

128732156 is a wasteful number, since it uses less digits than its factorization.

128732156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4597588 (or 4597586 counting only the distinct ones).

The product of its digits is 20160, while the sum is 35.

The square root of 128732156 is about 11346.0193900769. The cubic root of 128732156 is about 504.9274881999.

Adding to 128732156 its reverse (651237821), we get a palindrome (779969977).

The spelling of 128732156 in words is "one hundred twenty-eight million, seven hundred thirty-two thousand, one hundred fifty-six".