128678945 has 8 divisors (see below), whose sum is σ = 159739560. Its totient is φ = 99393280.

The previous prime is 128678917. The next prime is 128678947. The reversal of 128678945 is 549876821.

It can be written as a sum of positive squares in 4 ways, for example, as 23493409 + 105185536 = 4847^2 + 10256^2 .

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

It is not a de Polignac number, because 128678945 - 2⁶ = 128678881 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 128678893 and 128678902.

It is not an unprimeable number, because it can be changed into a prime (128678947) 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, 443576 + ... + 443865.

It is an arithmetic number, because the mean of its divisors is an integer number (19967445).

Almost surely, 2^128678945 is an apocalyptic number.

It is an amenable number.

128678945 is a deficient number, since it is larger than the sum of its proper divisors (31060615).

128678945 is an equidigital number, since it uses as much as digits as its factorization.

128678945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 887475.

The product of its digits is 967680, while the sum is 50.

The square root of 128678945 is about 11343.6742283971. The cubic root of 128678945 is about 504.8579085907.

It can be divided in two parts, 12867 and 8945, that added together give a palindrome (21812).

The spelling of 128678945 in words is "one hundred twenty-eight million, six hundred seventy-eight thousand, nine hundred forty-five".