28308514 has 24 divisors (see below), whose sum is σ = 46768212. Its totient is φ = 12841920.

The previous prime is 28308503. The next prime is 28308517. The reversal of 28308514 is 41580382.

It can be written as a sum of positive squares in 6 ways, for example, as 4950625 + 23357889 = 2225^2 + 4833^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (28308517) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19932 + ... + 21304.

Almost surely, 2^28308514 is an apocalyptic number.

28308514 is a deficient number, since it is larger than the sum of its proper divisors (18459698).

28308514 is a wasteful number, since it uses less digits than its factorization.

28308514 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1462 (or 1449 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 31.

The square root of 28308514 is about 5320.5745930303. The cubic root of 28308514 is about 304.7700999757.

Adding to 28308514 its reverse (41580382), we get a palindrome (69888896).

The spelling of 28308514 in words is "twenty-eight million, three hundred eight thousand, five hundred fourteen".