128436733 has 4 divisors (see below), whose sum is σ = 128847388. Its totient is φ = 128026080.

The previous prime is 128436727. The next prime is 128436739. The reversal of 128436733 is 337634821.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (128436727) and next prime (128436739).

It can be written as a sum of positive squares in 2 ways, for example, as 9474084 + 118962649 = 3078^2 + 10907^2 .

It is a cyclic number.

It is not a de Polignac number, because 128436733 - 2¹³ = 128428541 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 128436692 and 128436701.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128436739) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 204858 + ... + 205483.

It is an arithmetic number, because the mean of its divisors is an integer number (32211847).

Almost surely, 2^128436733 is an apocalyptic number.

It is an amenable number.

128436733 is a deficient number, since it is larger than the sum of its proper divisors (410655).

128436733 is an equidigital number, since it uses as much as digits as its factorization.

128436733 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 410654.

The product of its digits is 72576, while the sum is 37.

The square root of 128436733 is about 11332.9931174425. The cubic root of 128436733 is about 504.5409454487.

The spelling of 128436733 in words is "one hundred twenty-eight million, four hundred thirty-six thousand, seven hundred thirty-three".