28576531 has 2 divisors, whose sum is σ = 28576532. Its totient is φ = 28576530.

The previous prime is 28576501. The next prime is 28576567. The reversal of 28576531 is 13567582.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28576531 - 2⁷ = 28576403 is a prime.

It is a super-2 number, since 2×28576531² = 1633236247987922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28576501) 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, 14288265 + 14288266.

It is an arithmetic number, because the mean of its divisors is an integer number (14288266).

Almost surely, 2^28576531 is an apocalyptic number.

28576531 is a deficient number, since it is larger than the sum of its proper divisors (1).

28576531 is an equidigital number, since it uses as much as digits as its factorization.

28576531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 50400, while the sum is 37.

The square root of 28576531 is about 5345.7021054301. The cubic root of 28576531 is about 305.7289060986.

The spelling of 28576531 in words is "twenty-eight million, five hundred seventy-six thousand, five hundred thirty-one".