128809045 has 8 divisors (see below), whose sum is σ = 154645560. Its totient is φ = 102997440.

The previous prime is 128809033. The next prime is 128809049. The reversal of 128809045 is 540908821.

It can be written as a sum of positive squares in 4 ways, for example, as 58400164 + 70408881 = 7642^2 + 8391^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 128809045 - 2¹³ = 128800853 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 128808995 and 128809013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128809049) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8191 + ... + 18019.

It is an arithmetic number, because the mean of its divisors is an integer number (19330695).

Almost surely, 2^128809045 is an apocalyptic number.

It is an amenable number.

128809045 is a deficient number, since it is larger than the sum of its proper divisors (25836515).

128809045 is an equidigital number, since it uses as much as digits as its factorization.

128809045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12455.

The product of its (nonzero) digits is 23040, while the sum is 37.

The square root of 128809045 is about 11349.4072532445. The cubic root of 128809045 is about 505.0279957031.

The spelling of 128809045 in words is "one hundred twenty-eight million, eight hundred nine thousand, forty-five".