128264138 has 4 divisors (see below), whose sum is σ = 192396210. Its totient is φ = 64132068.

The previous prime is 128264137. The next prime is 128264173. The reversal of 128264138 is 831462821.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 126855169 + 1408969 = 11263^2 + 1187^2 .

It is a junction number, because it is equal to n+sod(n) for n = 128264098 and 128264107.

It is not an unprimeable number, because it can be changed into a prime (128264137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32066033 + ... + 32066036.

Almost surely, 2^128264138 is an apocalyptic number.

128264138 is a deficient number, since it is larger than the sum of its proper divisors (64132072).

128264138 is an equidigital number, since it uses as much as digits as its factorization.

128264138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64132071.

The product of its digits is 18432, while the sum is 35.

The square root of 128264138 is about 11325.3758436530. The cubic root of 128264138 is about 504.3148411804.

The spelling of 128264138 in words is "one hundred twenty-eight million, two hundred sixty-four thousand, one hundred thirty-eight".