28916613 has 24 divisors (see below), whose sum is σ = 47966880. Its totient is φ = 16601760.

The previous prime is 28916593. The next prime is 28916617. The reversal of 28916613 is 31661982.

28916613 is a `hidden beast` number, since 28 + 9 + 16 + 613 = 666.

It is not a de Polignac number, because 28916613 - 2⁵ = 28916581 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28916617) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5806 + ... + 9567.

It is an arithmetic number, because the mean of its divisors is an integer number (1998620).

Almost surely, 2^28916613 is an apocalyptic number.

It is an amenable number.

28916613 is a deficient number, since it is larger than the sum of its proper divisors (19050267).

28916613 is a wasteful number, since it uses less digits than its factorization.

28916613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15409 (or 15406 counting only the distinct ones).

The product of its digits is 15552, while the sum is 36.

The square root of 28916613 is about 5377.4169449653. The cubic root of 28916613 is about 306.9369271339.

The spelling of 28916613 in words is "twenty-eight million, nine hundred sixteen thousand, six hundred thirteen".