28780012 has 6 divisors (see below), whose sum is σ = 50365028. Its totient is φ = 14390004.

The previous prime is 28780009. The next prime is 28780021. The reversal of 28780012 is 21008782.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3597498 + ... + 3597505.

Almost surely, 2^28780012 is an apocalyptic number.

It is an amenable number.

28780012 is a deficient number, since it is larger than the sum of its proper divisors (21585016).

28780012 is a wasteful number, since it uses less digits than its factorization.

28780012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7195007 (or 7195005 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 28.

The square root of 28780012 is about 5364.7005508229. The cubic root of 28780012 is about 306.4528445418.

Adding to 28780012 its reverse (21008782), we get a palindrome (49788794).

The spelling of 28780012 in words is "twenty-eight million, seven hundred eighty thousand, twelve".