128301643 has 4 divisors (see below), whose sum is σ = 128410920. Its totient is φ = 128192368.

The previous prime is 128301631. The next prime is 128301647. The reversal of 128301643 is 346103821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 346103821 = 7 ⋅49443403.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128301643 is a prime.

It is a super-2 number, since 2×128301643² = 32922623192998898, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128301647) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52858 + ... + 55231.

It is an arithmetic number, because the mean of its divisors is an integer number (32102730).

Almost surely, 2^128301643 is an apocalyptic number.

128301643 is a deficient number, since it is larger than the sum of its proper divisors (109277).

128301643 is a wasteful number, since it uses less digits than its factorization.

128301643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109276.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 128301643 is about 11327.0315175689. The cubic root of 128301643 is about 504.3639910186.

The spelling of 128301643 in words is "one hundred twenty-eight million, three hundred one thousand, six hundred forty-three".