128787245 has 4 divisors (see below), whose sum is σ = 154544700. Its totient is φ = 103029792.

The previous prime is 128787229. The next prime is 128787251. The reversal of 128787245 is 542787821.

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 22676644 + 106110601 = 4762^2 + 10301^2 .

It is a cyclic number.

It is not a de Polignac number, because 128787245 - 2⁴ = 128787229 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 128787196 and 128787205.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12878720 + ... + 12878729.

It is an arithmetic number, because the mean of its divisors is an integer number (38636175).

Almost surely, 2^128787245 is an apocalyptic number.

It is an amenable number.

128787245 is a deficient number, since it is larger than the sum of its proper divisors (25757455).

128787245 is an equidigital number, since it uses as much as digits as its factorization.

128787245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25757454.

The product of its digits is 250880, while the sum is 44.

The square root of 128787245 is about 11348.4468100265. The cubic root of 128787245 is about 504.9995033162. Note that the first 3 decimals are identical.

The spelling of 128787245 in words is "one hundred twenty-eight million, seven hundred eighty-seven thousand, two hundred forty-five".