128641859 has 8 divisors (see below), whose sum is σ = 133074480. Its totient is φ = 124259616.

The previous prime is 128641831. The next prime is 128641871. The reversal of 128641859 is 958146821.

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

It is not a de Polignac number, because 128641859 - 2¹⁶ = 128576323 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128641879) 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, 7364 + ... + 17649.

It is an arithmetic number, because the mean of its divisors is an integer number (16634310).

Almost surely, 2^128641859 is an apocalyptic number.

128641859 is a deficient number, since it is larger than the sum of its proper divisors (4432621).

128641859 is a wasteful number, since it uses less digits than its factorization.

128641859 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25189.

The product of its digits is 138240, while the sum is 44.

The square root of 128641859 is about 11342.0394550539. The cubic root of 128641859 is about 504.8094029620.

The spelling of 128641859 in words is "one hundred twenty-eight million, six hundred forty-one thousand, eight hundred fifty-nine".