28215713 has 2 divisors, whose sum is σ = 28215714. Its totient is φ = 28215712.

The previous prime is 28215701. The next prime is 28215727. The reversal of 28215713 is 31751282.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26697889 + 1517824 = 5167^2 + 1232^2 .

It is a cyclic number.

It is not a de Polignac number, because 28215713 - 2¹⁰ = 28214689 is a prime.

It is a super-2 number, since 2×28215713² = 1592252920196738, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28215743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14107856 + 14107857.

It is an arithmetic number, because the mean of its divisors is an integer number (14107857).

Almost surely, 2^28215713 is an apocalyptic number.

It is an amenable number.

28215713 is a deficient number, since it is larger than the sum of its proper divisors (1).

28215713 is an equidigital number, since it uses as much as digits as its factorization.

28215713 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3360, while the sum is 29.

The square root of 28215713 is about 5311.8464774502. The cubic root of 28215713 is about 304.4367028428.

Adding to 28215713 its reverse (31751282), we get a palindrome (59966995).

The spelling of 28215713 in words is "twenty-eight million, two hundred fifteen thousand, seven hundred thirteen".