128904667 has 4 divisors (see below), whose sum is σ = 128927376. Its totient is φ = 128881960.

The previous prime is 128904661. The next prime is 128904679. The reversal of 128904667 is 766409821.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128904667 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128904661) 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, 5538 + ... + 16984.

It is an arithmetic number, because the mean of its divisors is an integer number (32231844).

Almost surely, 2^128904667 is an apocalyptic number.

128904667 is a deficient number, since it is larger than the sum of its proper divisors (22709).

128904667 is a wasteful number, since it uses less digits than its factorization.

128904667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22708.

The product of its (nonzero) digits is 145152, while the sum is 43.

The square root of 128904667 is about 11353.6191146260. The cubic root of 128904667 is about 505.1529347607.

The spelling of 128904667 in words is "one hundred twenty-eight million, nine hundred four thousand, six hundred sixty-seven".