128636426 has 8 divisors (see below), whose sum is σ = 194110560. Its totient is φ = 63932908.

The previous prime is 128636423. The next prime is 128636437. The reversal of 128636426 is 624636821.

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

It is a self number, because there is not a number n which added to its sum of digits gives 128636426.

It is not an unprimeable number, because it can be changed into a prime (128636423) 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, 192236 + ... + 192903.

It is an arithmetic number, because the mean of its divisors is an integer number (24263820).

Almost surely, 2^128636426 is an apocalyptic number.

128636426 is a deficient number, since it is larger than the sum of its proper divisors (65474134).

128636426 is a wasteful number, since it uses less digits than its factorization.

128636426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 385308.

The product of its digits is 82944, while the sum is 38.

The square root of 128636426 is about 11341.7999453350. The cubic root of 128636426 is about 504.8022962340.

The spelling of 128636426 in words is "one hundred twenty-eight million, six hundred thirty-six thousand, four hundred twenty-six".