128836494 has 40 divisors (see below), whose sum is σ = 294848928. Its totient is φ = 42029280.

The previous prime is 128836493. The next prime is 128836517. The reversal of 128836494 is 494638821.

It is a happy number.

128836494 is a `hidden beast` number, since 1 + 288 + 364 + 9 + 4 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128836493) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 847 + ... + 16074.

Almost surely, 2^128836494 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 128836494, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (147424464).

128836494 is an abundant number, since it is smaller than the sum of its proper divisors (166012434).

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

128836494 is a wasteful number, since it uses less digits than its factorization.

128836494 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16982 (or 16973 counting only the distinct ones).

The product of its digits is 331776, while the sum is 45.

The square root of 128836494 is about 11350.6164590299. The cubic root of 128836494 is about 505.0638667060.

The spelling of 128836494 in words is "one hundred twenty-eight million, eight hundred thirty-six thousand, four hundred ninety-four".