128712538 has 8 divisors (see below), whose sum is σ = 193119732. Its totient is φ = 64339296.

The previous prime is 128712533. The next prime is 128712553. The reversal of 128712538 is 835217821.

It can be written as a sum of positive squares in 2 ways, for example, as 121727089 + 6985449 = 11033^2 + 2643^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 128712497 and 128712506.

It is not an unprimeable number, because it can be changed into a prime (128712533) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5806 + ... + 17062.

Almost surely, 2^128712538 is an apocalyptic number.

128712538 is a deficient number, since it is larger than the sum of its proper divisors (64407194).

128712538 is a wasteful number, since it uses less digits than its factorization.

128712538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16976.

The product of its digits is 26880, while the sum is 37.

The square root of 128712538 is about 11345.1548248581. The cubic root of 128712538 is about 504.9018376010.

The spelling of 128712538 in words is "one hundred twenty-eight million, seven hundred twelve thousand, five hundred thirty-eight".