128672045 has 4 divisors (see below), whose sum is σ = 154406460. Its totient is φ = 102937632.

The previous prime is 128672023. The next prime is 128672053. The reversal of 128672045 is 540276821.

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 50154724 + 78517321 = 7082^2 + 8861^2 .

It is a cyclic number.

It is not a de Polignac number, because 128672045 - 2¹⁴ = 128655661 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 128671996 and 128672014.

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, 12867200 + ... + 12867209.

It is an arithmetic number, because the mean of its divisors is an integer number (38601615).

Almost surely, 2^128672045 is an apocalyptic number.

It is an amenable number.

128672045 is a deficient number, since it is larger than the sum of its proper divisors (25734415).

128672045 is an equidigital number, since it uses as much as digits as its factorization.

128672045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25734414.

The product of its (nonzero) digits is 26880, while the sum is 35.

The square root of 128672045 is about 11343.3700900570. The cubic root of 128672045 is about 504.8488846285.

The spelling of 128672045 in words is "one hundred twenty-eight million, six hundred seventy-two thousand, forty-five".