28660869 has 6 divisors (see below), whose sum is σ = 41399046. Its totient is φ = 19107240.

The previous prime is 28660867. The next prime is 28660889. The reversal of 28660869 is 96806682.

It can be written as a sum of positive squares in only one way, i.e., 25100100 + 3560769 = 5010^2 + 1887^2 .

It is not a de Polignac number, because 28660869 - 2¹ = 28660867 is a prime.

It is a super-2 number, since 2×28660869² = 1642890823670322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28660867) 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, 1592262 + ... + 1592279.

It is an arithmetic number, because the mean of its divisors is an integer number (6899841).

Almost surely, 2^28660869 is an apocalyptic number.

It is an amenable number.

28660869 is a deficient number, since it is larger than the sum of its proper divisors (12738177).

28660869 is a wasteful number, since it uses less digits than its factorization.

28660869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3184547 (or 3184544 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 45.

The square root of 28660869 is about 5353.5846869177. The cubic root of 28660869 is about 306.0293769054.

The spelling of 28660869 in words is "twenty-eight million, six hundred sixty thousand, eight hundred sixty-nine".