128301639 has 4 divisors (see below), whose sum is σ = 171068856. Its totient is φ = 85534424.

The previous prime is 128301631. The next prime is 128301647. The reversal of 128301639 is 936103821.

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

It is an interprime number because it is at equal distance from previous prime (128301631) and next prime (128301647).

It is a cyclic number.

It is not a de Polignac number, because 128301639 - 2³ = 128301631 is a prime.

It is a super-2 number, since 2×128301639² = 32922621140172642, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128301631) 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, 21383604 + ... + 21383609.

It is an arithmetic number, because the mean of its divisors is an integer number (42767214).

Almost surely, 2^128301639 is an apocalyptic number.

128301639 is a deficient number, since it is larger than the sum of its proper divisors (42767217).

128301639 is an equidigital number, since it uses as much as digits as its factorization.

128301639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42767216.

The product of its (nonzero) digits is 7776, while the sum is 33.

The square root of 128301639 is about 11327.0313410002. The cubic root of 128301639 is about 504.3639857771.

The spelling of 128301639 in words is "one hundred twenty-eight million, three hundred one thousand, six hundred thirty-nine".