128702345 has 4 divisors (see below), whose sum is σ = 154442820. Its totient is φ = 102961872.

The previous prime is 128702341. The next prime is 128702383. The reversal of 128702345 is 543207821.

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

It can be written as a sum of positive squares in 2 ways, for example, as 88303609 + 40398736 = 9397^2 + 6356^2 .

It is a cyclic number.

It is not a de Polignac number, because 128702345 - 2² = 128702341 is a prime.

It is not an unprimeable number, because it can be changed into a prime (128702341) 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 3 ways as a sum of consecutive naturals, for example, 12870230 + ... + 12870239.

It is an arithmetic number, because the mean of its divisors is an integer number (38610705).

Almost surely, 2^128702345 is an apocalyptic number.

It is an amenable number.

128702345 is a deficient number, since it is larger than the sum of its proper divisors (25740475).

128702345 is an equidigital number, since it uses as much as digits as its factorization.

128702345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25740474.

The product of its (nonzero) digits is 13440, while the sum is 32.

The square root of 128702345 is about 11344.7055933594. The cubic root of 128702345 is about 504.8885091914. Note that the first 3 decimals are identical.

The spelling of 128702345 in words is "one hundred twenty-eight million, seven hundred two thousand, three hundred forty-five".