128860446 has 64 divisors (see below), whose sum is σ = 305980416. Its totient is φ = 35664000.

The previous prime is 128860441. The next prime is 128860447. The reversal of 128860446 is 644068821.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128860441) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 85915 + ... + 87401.

It is an arithmetic number, because the mean of its divisors is an integer number (4780944).

Almost surely, 2^128860446 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 128860446, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (152990208).

128860446 is an abundant number, since it is smaller than the sum of its proper divisors (177119970).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

128860446 is a wasteful number, since it uses less digits than its factorization.

128860446 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1617.

The product of its (nonzero) digits is 73728, while the sum is 39.

The square root of 128860446 is about 11351.6715068751. The cubic root of 128860446 is about 505.0951635841.

The spelling of 128860446 in words is "one hundred twenty-eight million, eight hundred sixty thousand, four hundred forty-six".