28030312 has 32 divisors (see below), whose sum is σ = 54330120. Its totient is φ = 13547520.

The previous prime is 28030279. The next prime is 28030319. The reversal of 28030312 is 21303082.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 26977636 + 1052676 = 5194^2 + 1026^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 28030312.

It is not an unprimeable number, because it can be changed into a prime (28030319) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 83008 + ... + 83344.

Almost surely, 2^28030312 is an apocalyptic number.

It is an amenable number.

28030312 is a deficient number, since it is larger than the sum of its proper divisors (26299808).

28030312 is a wasteful number, since it uses less digits than its factorization.

28030312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 661 (or 657 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 28030312 is about 5294.3660621457. The cubic root of 28030312 is about 303.7684351516.

Adding to 28030312 its reverse (21303082), we get a palindrome (49333394).

The spelling of 28030312 in words is "twenty-eight million, thirty thousand, three hundred twelve".