28315269 has 6 divisors (see below), whose sum is σ = 40899846. Its totient is φ = 18876840.

The previous prime is 28315247. The next prime is 28315289. The reversal of 28315269 is 96251382.

It can be written as a sum of positive squares in only one way, i.e., 25553025 + 2762244 = 5055^2 + 1662^2 .

It is not a de Polignac number, because 28315269 - 2⁵ = 28315237 is a prime.

It is a super-2 number, since 2×28315269² = 1603508917084722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28315229) 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, 1573062 + ... + 1573079.

It is an arithmetic number, because the mean of its divisors is an integer number (6816641).

Almost surely, 2^28315269 is an apocalyptic number.

It is an amenable number.

28315269 is a deficient number, since it is larger than the sum of its proper divisors (12584577).

28315269 is a wasteful number, since it uses less digits than its factorization.

28315269 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3146147 (or 3146144 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The square root of 28315269 is about 5321.2093550245. The cubic root of 28315269 is about 304.7943395419.

It can be divided in two parts, 2831 and 5269, that added together give a square (8100 = 90²).

The spelling of 28315269 in words is "twenty-eight million, three hundred fifteen thousand, two hundred sixty-nine".