28000012 has 6 divisors (see below), whose sum is σ = 49000028. Its totient is φ = 14000004.

The previous prime is 27999943. The next prime is 28000019. The reversal of 28000012 is 21000082.

It is a junction number, because it is equal to n+sod(n) for n = 27999956 and 28000001.

It is not an unprimeable number, because it can be changed into a prime (28000019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3499998 + ... + 3500005.

Almost surely, 2^28000012 is an apocalyptic number.

It is an amenable number.

28000012 is a deficient number, since it is larger than the sum of its proper divisors (21000016).

28000012 is a wasteful number, since it uses less digits than its factorization.

28000012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7000007 (or 7000005 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 28000012 is about 5291.5037560225. The cubic root of 28000012 is about 303.6589405674.

Adding to 28000012 its reverse (21000082), we get a palindrome (49000094).

The spelling of 28000012 in words is "twenty-eight million, twelve", and thus it is an aban number and an uban number.