128636542 has 8 divisors (see below), whose sum is σ = 193190616. Its totient is φ = 64239672.

The previous prime is 128636533. The next prime is 128636567. The reversal of 128636542 is 245636821.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37233 + ... + 40540.

It is an arithmetic number, because the mean of its divisors is an integer number (24148827).

Almost surely, 2^128636542 is an apocalyptic number.

128636542 is a deficient number, since it is larger than the sum of its proper divisors (64554074).

128636542 is an equidigital number, since it uses as much as digits as its factorization.

128636542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78602.

The product of its digits is 69120, while the sum is 37.

The square root of 128636542 is about 11341.8050591606. The cubic root of 128636542 is about 504.8024479719.

The spelling of 128636542 in words is "one hundred twenty-eight million, six hundred thirty-six thousand, five hundred forty-two".