28791212 has 6 divisors (see below), whose sum is σ = 50384628. Its totient is φ = 14395604.

The previous prime is 28791211. The next prime is 28791221. The reversal of 28791212 is 21219782.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (28791211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3598898 + ... + 3598905.

It is an arithmetic number, because the mean of its divisors is an integer number (8397438).

Almost surely, 2^28791212 is an apocalyptic number.

It is an amenable number.

28791212 is a deficient number, since it is larger than the sum of its proper divisors (21593416).

28791212 is a wasteful number, since it uses less digits than its factorization.

28791212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7197807 (or 7197805 counting only the distinct ones).

The product of its digits is 4032, while the sum is 32.

The square root of 28791212 is about 5365.7443099723. The cubic root of 28791212 is about 306.4925923446.

The spelling of 28791212 in words is "twenty-eight million, seven hundred ninety-one thousand, two hundred twelve".