28667608438 has 64 divisors (see below), whose sum is σ = 51435648000. Its totient is φ = 11723854464.

The previous prime is 28667608433. The next prime is 28667608439. The reversal of 28667608438 is 83480676682.

It is a Harshad number since it is a multiple of its sum of digits (58).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28667608433) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 29162895 + ... + 29163877.

It is an arithmetic number, because the mean of its divisors is an integer number (803682000).

Almost surely, 2^28667608438 is an apocalyptic number.

28667608438 is a deficient number, since it is larger than the sum of its proper divisors (22768039562).

28667608438 is a wasteful number, since it uses less digits than its factorization.

28667608438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1789.

The product of its (nonzero) digits is 18579456, while the sum is 58.

The spelling of 28667608438 in words is "twenty-eight billion, six hundred sixty-seven million, six hundred eight thousand, four hundred thirty-eight".