28081616 has 10 divisors (see below), whose sum is σ = 54408162. Its totient is φ = 14040800.

The previous prime is 28081609. The next prime is 28081633. The reversal of 28081616 is 61618082.

It can be written as a sum of positive squares in only one way, i.e., 27081616 + 1000000 = 5204^2 + 1000^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 877535 + ... + 877566.

Almost surely, 2^28081616 is an apocalyptic number.

It is an amenable number.

28081616 is a deficient number, since it is larger than the sum of its proper divisors (26326546).

28081616 is a wasteful number, since it uses less digits than its factorization.

28081616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1755109 (or 1755103 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 32.

The square root of 28081616 is about 5299.2089975769. The cubic root of 28081616 is about 303.9536517521.

Adding to 28081616 its reverse (61618082), we get a palindrome (89699698).

The spelling of 28081616 in words is "twenty-eight million, eighty-one thousand, six hundred sixteen".