128207638 has 8 divisors (see below), whose sum is σ = 207104688. Its totient is φ = 59172744.

The previous prime is 128207633. The next prime is 128207641. The reversal of 128207638 is 836702821.

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 = 128207597 and 128207606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128207633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2465506 + ... + 2465557.

It is an arithmetic number, because the mean of its divisors is an integer number (25888086).

Almost surely, 2^128207638 is an apocalyptic number.

128207638 is a deficient number, since it is larger than the sum of its proper divisors (78897050).

128207638 is a wasteful number, since it uses less digits than its factorization.

128207638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4931078.

The product of its (nonzero) digits is 32256, while the sum is 37.

The square root of 128207638 is about 11322.8811704442. The cubic root of 128207638 is about 504.2407805380.

The spelling of 128207638 in words is "one hundred twenty-eight million, two hundred seven thousand, six hundred thirty-eight".