28543069 has 4 divisors (see below), whose sum is σ = 29784096. Its totient is φ = 27302044.

The previous prime is 28543063. The next prime is 28543087. The reversal of 28543069 is 96034582.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28543069 - 2³ = 28543061 is a prime.

It is a super-2 number, since 2×28543069² = 1629413575877522, 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 (28543061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 620479 + ... + 620524.

It is an arithmetic number, because the mean of its divisors is an integer number (7446024).

Almost surely, 2^28543069 is an apocalyptic number.

It is an amenable number.

28543069 is a deficient number, since it is larger than the sum of its proper divisors (1241027).

28543069 is a wasteful number, since it uses less digits than its factorization.

28543069 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1241026.

The product of its (nonzero) digits is 51840, while the sum is 37.

The square root of 28543069 is about 5342.5713846424. The cubic root of 28543069 is about 305.6095272938.

The spelling of 28543069 in words is "twenty-eight million, five hundred forty-three thousand, sixty-nine".