128228507 has 4 divisors (see below), whose sum is σ = 139885656. Its totient is φ = 116571360.

The previous prime is 128228497. The next prime is 128228509. The reversal of 128228507 is 705822821.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 128228507 - 2⁴ = 128228491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128228509) 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, 5828558 + ... + 5828579.

It is an arithmetic number, because the mean of its divisors is an integer number (34971414).

Almost surely, 2^128228507 is an apocalyptic number.

128228507 is a deficient number, since it is larger than the sum of its proper divisors (11657149).

128228507 is a wasteful number, since it uses less digits than its factorization.

128228507 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11657148.

The product of its (nonzero) digits is 17920, while the sum is 35.

The square root of 128228507 is about 11323.8026740137. The cubic root of 128228507 is about 504.2681383203.

The spelling of 128228507 in words is "one hundred twenty-eight million, two hundred twenty-eight thousand, five hundred seven".