128675421 has 48 divisors (see below), whose sum is σ = 220105600. Its totient is φ = 72394560.

The previous prime is 128675387. The next prime is 128675423. The reversal of 128675421 is 124576821.

It is not a de Polignac number, because 128675421 - 2¹¹ = 128673373 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128675423) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 225066 + ... + 225636.

Almost surely, 2^128675421 is an apocalyptic number.

It is an amenable number.

128675421 is a deficient number, since it is larger than the sum of its proper divisors (91430179).

128675421 is an equidigital number, since it uses as much as digits as its factorization.

128675421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 671 (or 654 counting only the distinct ones).

The product of its digits is 26880, while the sum is 36.

The square root of 128675421 is about 11343.5188984724. The cubic root of 128675421 is about 504.8532998712.

The spelling of 128675421 in words is "one hundred twenty-eight million, six hundred seventy-five thousand, four hundred twenty-one".