28812004 has 12 divisors (see below), whose sum is σ = 54299644. Its totient is φ = 13297824.

The previous prime is 28811983. The next prime is 28812023. The reversal of 28812004 is 40021882.

It can be written as a sum of positive squares in 2 ways, for example, as 2822400 + 25989604 = 1680^2 + 5098^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 28812004.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 276987 + ... + 277090.

Almost surely, 2^28812004 is an apocalyptic number.

It is an amenable number.

28812004 is a deficient number, since it is larger than the sum of its proper divisors (25487640).

28812004 is a wasteful number, since it uses less digits than its factorization.

28812004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 554094 (or 554092 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 25.

The square root of 28812004 is about 5367.6814361510. The cubic root of 28812004 is about 306.5663539791.

Adding to 28812004 its reverse (40021882), we get a palindrome (68833886).

The spelling of 28812004 in words is "twenty-eight million, eight hundred twelve thousand, four".