128610989 has 16 divisors (see below), whose sum is σ = 141657600. Its totient is φ = 116043840.

The previous prime is 128610947. The next prime is 128610991. The reversal of 128610989 is 989016821.

It is a cyclic number.

It is not a de Polignac number, because 128610989 - 2¹² = 128606893 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 (128610689) 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, 129284 + ... + 130274.

It is an arithmetic number, because the mean of its divisors is an integer number (8853600).

Almost surely, 2^128610989 is an apocalyptic number.

It is an amenable number.

128610989 is a deficient number, since it is larger than the sum of its proper divisors (13046611).

128610989 is a wasteful number, since it uses less digits than its factorization.

128610989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1220.

The product of its (nonzero) digits is 62208, while the sum is 44.

The square root of 128610989 is about 11340.6785070383. The cubic root of 128610989 is about 504.7690202720.

The spelling of 128610989 in words is "one hundred twenty-eight million, six hundred ten thousand, nine hundred eighty-nine".