128603861 has 16 divisors (see below), whose sum is σ = 138692736. Its totient is φ = 118818816.

The previous prime is 128603809. The next prime is 128603873. The reversal of 128603861 is 168306821.

It is a cyclic number.

It is not a de Polignac number, because 128603861 - 2¹⁴ = 128587477 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 (128605861) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 275150 + ... + 275616.

It is an arithmetic number, because the mean of its divisors is an integer number (8668296).

Almost surely, 2^128603861 is an apocalyptic number.

It is an amenable number.

128603861 is a deficient number, since it is larger than the sum of its proper divisors (10088875).

128603861 is a wasteful number, since it uses less digits than its factorization.

128603861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 748.

The product of its (nonzero) digits is 13824, while the sum is 35.

The square root of 128603861 is about 11340.3642357730. The cubic root of 128603861 is about 504.7596948375.

The spelling of 128603861 in words is "one hundred twenty-eight million, six hundred three thousand, eight hundred sixty-one".