128631332 has 6 divisors (see below), whose sum is σ = 225104838. Its totient is φ = 64315664.

The previous prime is 128631331. The next prime is 128631337. The reversal of 128631332 is 233136821.

It can be written as a sum of positive squares in only one way, i.e., 74373376 + 54257956 = 8624^2 + 7366^2 .

It is a junction number, because it is equal to n+sod(n) for n = 128631295 and 128631304.

It is not an unprimeable number, because it can be changed into a prime (128631331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16078913 + ... + 16078920.

It is an arithmetic number, because the mean of its divisors is an integer number (37517473).

Almost surely, 2^128631332 is an apocalyptic number.

It is an amenable number.

128631332 is a deficient number, since it is larger than the sum of its proper divisors (96473506).

128631332 is a wasteful number, since it uses less digits than its factorization.

128631332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32157837 (or 32157835 counting only the distinct ones).

The product of its digits is 5184, while the sum is 29.

The square root of 128631332 is about 11341.5753755816. The cubic root of 128631332 is about 504.7956327590.

The spelling of 128631332 in words is "one hundred twenty-eight million, six hundred thirty-one thousand, three hundred thirty-two".