128111684 has 6 divisors (see below), whose sum is σ = 224195454. Its totient is φ = 64055840.

The previous prime is 128111639. The next prime is 128111689. The reversal of 128111684 is 486111821.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 122589184 + 5522500 = 11072^2 + 2350^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 128111684.

It is not an unprimeable number, because it can be changed into a prime (128111689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16013957 + ... + 16013964.

It is an arithmetic number, because the mean of its divisors is an integer number (37365909).

Almost surely, 2^128111684 is an apocalyptic number.

It is an amenable number.

128111684 is a deficient number, since it is larger than the sum of its proper divisors (96083770).

128111684 is a wasteful number, since it uses less digits than its factorization.

128111684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32027925 (or 32027923 counting only the distinct ones).

The product of its digits is 3072, while the sum is 32.

The square root of 128111684 is about 11318.6432049076. The cubic root of 128111684 is about 504.1149534130.

The spelling of 128111684 in words is "one hundred twenty-eight million, one hundred eleven thousand, six hundred eighty-four".