28120616 has 16 divisors (see below), whose sum is σ = 52794240. Its totient is φ = 14042160.

The previous prime is 28120607. The next prime is 28120619. The reversal of 28120616 is 61602182.

It is not an unprimeable number, because it can be changed into a prime (28120619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6155 + ... + 9701.

It is an arithmetic number, because the mean of its divisors is an integer number (3299640).

Almost surely, 2^28120616 is an apocalyptic number.

It is an amenable number.

28120616 is a deficient number, since it is larger than the sum of its proper divisors (24673624).

28120616 is a wasteful number, since it uses less digits than its factorization.

28120616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4544 (or 4540 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 28120616 is about 5302.8875153071. The cubic root of 28120616 is about 304.0942978473.

Adding to 28120616 its reverse (61602182), we get a palindrome (89722798).

The spelling of 28120616 in words is "twenty-eight million, one hundred twenty thousand, six hundred sixteen".