128662306 has 4 divisors (see below), whose sum is σ = 192993462. Its totient is φ = 64331152.

The previous prime is 128662301. The next prime is 128662327. The reversal of 128662306 is 603266821.

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: 603266821 = 431 ⋅1399691.

It can be written as a sum of positive squares in only one way, i.e., 88454025 + 40208281 = 9405^2 + 6341^2 .

It is not an unprimeable number, because it can be changed into a prime (128662301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32165575 + ... + 32165578.

Almost surely, 2^128662306 is an apocalyptic number.

128662306 is a deficient number, since it is larger than the sum of its proper divisors (64331156).

128662306 is an equidigital number, since it uses as much as digits as its factorization.

128662306 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64331155.

The product of its (nonzero) digits is 20736, while the sum is 34.

The square root of 128662306 is about 11342.9408003392. The cubic root of 128662306 is about 504.8361472144.

The spelling of 128662306 in words is "one hundred twenty-eight million, six hundred sixty-two thousand, three hundred six".