28667912 has 64 divisors (see below), whose sum is σ = 67495680. Its totient is φ = 11112192.

The previous prime is 28667911. The next prime is 28667917. The reversal of 28667912 is 21976682.

It is a self number, because there is not a number n which added to its sum of digits gives 28667912.

It is not an unprimeable number, because it can be changed into a prime (28667911) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38213 + ... + 38955.

It is an arithmetic number, because the mean of its divisors is an integer number (1054620).

Almost surely, 2^28667912 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28667912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33747840).

28667912 is an abundant number, since it is smaller than the sum of its proper divisors (38827768).

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

28667912 is a wasteful number, since it uses less digits than its factorization.

28667912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 822 (or 818 counting only the distinct ones).

The product of its digits is 72576, while the sum is 41.

The square root of 28667912 is about 5354.2424300736. The cubic root of 28667912 is about 306.0544423047.

The spelling of 28667912 in words is "twenty-eight million, six hundred sixty-seven thousand, nine hundred twelve".