28047069 has 6 divisors (see below), whose sum is σ = 40512446. Its totient is φ = 18698040.

The previous prime is 28047067. The next prime is 28047077. The reversal of 28047069 is 96074082.

It can be written as a sum of positive squares in only one way, i.e., 21483225 + 6563844 = 4635^2 + 2562^2 .

It is not a de Polignac number, because 28047069 - 2¹ = 28047067 is a prime.

It is a super-2 number, since 2×28047069² = 1573276158981522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28047067) 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, 1558162 + ... + 1558179.

Almost surely, 2^28047069 is an apocalyptic number.

It is an amenable number.

28047069 is a deficient number, since it is larger than the sum of its proper divisors (12465377).

28047069 is a wasteful number, since it uses less digits than its factorization.

28047069 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3116347 (or 3116344 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 28047069 is about 5295.9483569990. The cubic root of 28047069 is about 303.8289557487.

The spelling of 28047069 in words is "twenty-eight million, forty-seven thousand, sixty-nine".