28667238 has 16 divisors (see below), whose sum is σ = 60352320. Its totient is φ = 9052776.

The previous prime is 28667231. The next prime is 28667279. The reversal of 28667238 is 83276682.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 28667238.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28667231) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 125620 + ... + 125847.

It is an arithmetic number, because the mean of its divisors is an integer number (3772020).

Almost surely, 2^28667238 is an apocalyptic number.

28667238 is an abundant number, since it is smaller than the sum of its proper divisors (31685082).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28667238 is a wasteful number, since it uses less digits than its factorization.

28667238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 251491.

The product of its digits is 193536, while the sum is 42.

The square root of 28667238 is about 5354.1794889600. The cubic root of 28667238 is about 306.0520437773.

The spelling of 28667238 in words is "twenty-eight million, six hundred sixty-seven thousand, two hundred thirty-eight".