28072069 has 2 divisors, whose sum is σ = 28072070. Its totient is φ = 28072068.

The previous prime is 28072061. The next prime is 28072111. The reversal of 28072069 is 96027082.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16769025 + 11303044 = 4095^2 + 3362^2 .

It is a cyclic number.

It is not a de Polignac number, because 28072069 - 2³ = 28072061 is a prime.

It is a super-2 number, since 2×28072069² = 1576082115881522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28072061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14036034 + 14036035.

It is an arithmetic number, because the mean of its divisors is an integer number (14036035).

Almost surely, 2^28072069 is an apocalyptic number.

It is an amenable number.

28072069 is a deficient number, since it is larger than the sum of its proper divisors (1).

28072069 is an equidigital number, since it uses as much as digits as its factorization.

28072069 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 28072069 is about 5298.3081261852. The cubic root of 28072069 is about 303.9192024713.

The spelling of 28072069 in words is "twenty-eight million, seventy-two thousand, sixty-nine".