128621759 has 8 divisors (see below), whose sum is σ = 151738368. Its totient is φ = 106690680.

The previous prime is 128621723. The next prime is 128621761. The reversal of 128621759 is 957126821.

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

It is a cyclic number.

It is not a de Polignac number, because 128621759 - 2⁸ = 128621503 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128621159) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 296147 + ... + 296580.

It is an arithmetic number, because the mean of its divisors is an integer number (18967296).

Almost surely, 2^128621759 is an apocalyptic number.

128621759 is a deficient number, since it is larger than the sum of its proper divisors (23116609).

128621759 is an equidigital number, since it uses as much as digits as its factorization.

128621759 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 592765.

The product of its digits is 60480, while the sum is 41.

The square root of 128621759 is about 11341.1533364116. The cubic root of 128621759 is about 504.7831098161.

The spelling of 128621759 in words is "one hundred twenty-eight million, six hundred twenty-one thousand, seven hundred fifty-nine".