128386458 has 80 divisors (see below), whose sum is σ = 308927520. Its totient is φ = 39727584.

The previous prime is 128386441. The next prime is 128386463. The reversal of 128386458 is 854683821.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 162741 + ... + 163527.

It is an arithmetic number, because the mean of its divisors is an integer number (3861594).

Almost surely, 2^128386458 is an apocalyptic number.

128386458 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 128386458, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (154463760).

128386458 is an abundant number, since it is smaller than the sum of its proper divisors (180541062).

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

128386458 is a wasteful number, since it uses less digits than its factorization.

128386458 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 873 (or 864 counting only the distinct ones).

The product of its digits is 368640, while the sum is 45.

The square root of 128386458 is about 11330.7748190492. The cubic root of 128386458 is about 504.4751047143.

The spelling of 128386458 in words is "one hundred twenty-eight million, three hundred eighty-six thousand, four hundred fifty-eight".