128646145 has 4 divisors (see below), whose sum is σ = 154375380. Its totient is φ = 102916912.

The previous prime is 128646127. The next prime is 128646179. The reversal of 128646145 is 541646821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 541646821 = 103 ⋅5258707.

It can be written as a sum of positive squares in 2 ways, for example, as 57699216 + 70946929 = 7596^2 + 8423^2 .

It is a cyclic number.

It is not a de Polignac number, because 128646145 - 2⁵ = 128646113 is a prime.

It is a super-2 number, since 2×128646145² = 33099661246722050, which contains 22 as substring.

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, 12864610 + ... + 12864619.

It is an arithmetic number, because the mean of its divisors is an integer number (38593845).

Almost surely, 2^128646145 is an apocalyptic number.

It is an amenable number.

128646145 is a deficient number, since it is larger than the sum of its proper divisors (25729235).

128646145 is an equidigital number, since it uses as much as digits as its factorization.

128646145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25729234.

The product of its digits is 46080, while the sum is 37.

The square root of 128646145 is about 11342.2283965718. The cubic root of 128646145 is about 504.8150091960.

The spelling of 128646145 in words is "one hundred twenty-eight million, six hundred forty-six thousand, one hundred forty-five".