128931332 has 24 divisors (see below), whose sum is σ = 247143960. Its totient is φ = 58580480.

The previous prime is 128931331. The next prime is 128931367. The reversal of 128931332 is 233139821.

It can be written as a sum of positive squares in 4 ways, for example, as 6031936 + 122899396 = 2456^2 + 11086^2 .

It is not an unprimeable number, because it can be changed into a prime (128931331) 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, 30719 + ... + 34662.

It is an arithmetic number, because the mean of its divisors is an integer number (10297665).

Almost surely, 2^128931332 is an apocalyptic number.

It is an amenable number.

128931332 is a deficient number, since it is larger than the sum of its proper divisors (118212628).

128931332 is a wasteful number, since it uses less digits than its factorization.

128931332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65431 (or 65429 counting only the distinct ones).

The product of its digits is 7776, while the sum is 32.

The square root of 128931332 is about 11354.7933490663. The cubic root of 128931332 is about 505.1877640513.

The spelling of 128931332 in words is "one hundred twenty-eight million, nine hundred thirty-one thousand, three hundred thirty-two".