128139264 has 180 divisors, whose sum is σ = 408932160. Its totient is φ = 38338560.

The previous prime is 128139257. The next prime is 128139283. The reversal of 128139264 is 462931821.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1621977 + ... + 1622055.

Almost surely, 2^128139264 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 128139264, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (204466080).

128139264 is an abundant number, since it is smaller than the sum of its proper divisors (280792896).

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

128139264 is an equidigital number, since it uses as much as digits as its factorization.

128139264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124 (or 95 counting only the distinct ones).

The product of its digits is 20736, while the sum is 36.

The square root of 128139264 is about 11319.8614832515. The cubic root of 128139264 is about 504.1511262594.

The spelling of 128139264 in words is "one hundred twenty-eight million, one hundred thirty-nine thousand, two hundred sixty-four".