128757386 has 4 divisors (see below), whose sum is σ = 193136082. Its totient is φ = 64378692.

The previous prime is 128757379. The next prime is 128757389. The reversal of 128757386 is 683757821.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 683757821 = 137 ⋅4990933.

It can be written as a sum of positive squares in only one way, i.e., 126450025 + 2307361 = 11245^2 + 1519^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 128757386.

It is not an unprimeable number, because it can be changed into a prime (128757389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32189345 + ... + 32189348.

Almost surely, 2^128757386 is an apocalyptic number.

128757386 is a deficient number, since it is larger than the sum of its proper divisors (64378696).

128757386 is an equidigital number, since it uses as much as digits as its factorization.

128757386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64378695.

The product of its digits is 564480, while the sum is 47.

The square root of 128757386 is about 11347.1311792893. The cubic root of 128757386 is about 504.9604726766.

The spelling of 128757386 in words is "one hundred twenty-eight million, seven hundred fifty-seven thousand, three hundred eighty-six".