28308516 has 12 divisors (see below), whose sum is σ = 66053232. Its totient is φ = 9436168.

The previous prime is 28308503. The next prime is 28308517. The reversal of 28308516 is 61580382.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a Smith number, since the sum of its digits (33) 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 3 ways as a sum of consecutive naturals, for example, 1179510 + ... + 1179533.

It is an arithmetic number, because the mean of its divisors is an integer number (5504436).

Almost surely, 2^28308516 is an apocalyptic number.

It is an amenable number.

28308516 is an abundant number, since it is smaller than the sum of its proper divisors (37744716).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28308516 is a wasteful number, since it uses less digits than its factorization.

28308516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2359050 (or 2359048 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 33.

The square root of 28308516 is about 5320.5747809800. The cubic root of 28308516 is about 304.7701071531.

Adding to 28308516 its reverse (61580382), we get a palindrome (89888898).

The spelling of 28308516 in words is "twenty-eight million, three hundred eight thousand, five hundred sixteen".