28578031 has 2 divisors, whose sum is σ = 28578032. Its totient is φ = 28578030.

The previous prime is 28578019. The next prime is 28578047. The reversal of 28578031 is 13087582.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28578031 - 2¹¹ = 28575983 is a prime.

It is a super-2 number, since 2×28578031² = 1633407711673922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28578091) 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 as a sum of consecutive naturals, namely, 14289015 + 14289016.

It is an arithmetic number, because the mean of its divisors is an integer number (14289016).

Almost surely, 2^28578031 is an apocalyptic number.

28578031 is a deficient number, since it is larger than the sum of its proper divisors (1).

28578031 is an equidigital number, since it uses as much as digits as its factorization.

28578031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13440, while the sum is 34.

The square root of 28578031 is about 5345.8424032139. The cubic root of 28578031 is about 305.7342553056.

The spelling of 28578031 in words is "twenty-eight million, five hundred seventy-eight thousand, thirty-one".