28578161 has 2 divisors, whose sum is σ = 28578162. Its totient is φ = 28578160.

The previous prime is 28578133. The next prime is 28578163. The reversal of 28578161 is 16187582.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15840400 + 12737761 = 3980^2 + 3569^2 .

It is a cyclic number.

It is not a de Polignac number, because 28578161 - 2¹⁰ = 28577137 is a prime.

It is a super-2 number, since 2×28578161² = 1633422572283842, which contains 22 as substring.

Together with 28578163, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28578163) 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, 14289080 + 14289081.

It is an arithmetic number, because the mean of its divisors is an integer number (14289081).

Almost surely, 2^28578161 is an apocalyptic number.

It is an amenable number.

28578161 is a deficient number, since it is larger than the sum of its proper divisors (1).

28578161 is an equidigital number, since it uses as much as digits as its factorization.

28578161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 26880, while the sum is 38.

The square root of 28578161 is about 5345.8545621818. The cubic root of 28578161 is about 305.7347188947.

The spelling of 28578161 in words is "twenty-eight million, five hundred seventy-eight thousand, one hundred sixty-one".