28915713 has 6 divisors (see below), whose sum is σ = 41767154. Its totient is φ = 19277136.

The previous prime is 28915703. The next prime is 28915721. The reversal of 28915713 is 31751982.

28915713 is a `hidden beast` number, since 2 + 89 + 1 + 571 + 3 = 666.

It can be written as a sum of positive squares in only one way, i.e., 18045504 + 10870209 = 4248^2 + 3297^2 .

It is not a de Polignac number, because 28915713 - 2¹⁰ = 28914689 is a prime.

It is a super-2 number, since 2×28915713² = 1672236916596738, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28915703) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1606420 + ... + 1606437.

Almost surely, 2^28915713 is an apocalyptic number.

It is an amenable number.

28915713 is a deficient number, since it is larger than the sum of its proper divisors (12851441).

28915713 is a wasteful number, since it uses less digits than its factorization.

28915713 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3212863 (or 3212860 counting only the distinct ones).

The product of its digits is 15120, while the sum is 36.

The square root of 28915713 is about 5377.3332610133. Note that the first 3 decimals coincide. The cubic root of 28915713 is about 306.9337427349.

The spelling of 28915713 in words is "twenty-eight million, nine hundred fifteen thousand, seven hundred thirteen".