28616013 has 6 divisors (see below), whose sum is σ = 41334254. Its totient is φ = 19077336.

The previous prime is 28616009. The next prime is 28616017. The reversal of 28616013 is 31061682.

It is an interprime number because it is at equal distance from previous prime (28616009) and next prime (28616017).

It can be written as a sum of positive squares in only one way, i.e., 27688644 + 927369 = 5262^2 + 963^2 .

It is not a de Polignac number, because 28616013 - 2² = 28616009 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28616017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1589770 + ... + 1589787.

Almost surely, 2^28616013 is an apocalyptic number.

It is an amenable number.

28616013 is a deficient number, since it is larger than the sum of its proper divisors (12718241).

28616013 is a wasteful number, since it uses less digits than its factorization.

28616013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3179563 (or 3179560 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 28616013 is about 5349.3937039631. The cubic root of 28616013 is about 305.8696420268.

Adding to 28616013 its reverse (31061682), we get a palindrome (59677695).

The spelling of 28616013 in words is "twenty-eight million, six hundred sixteen thousand, thirteen".