28572839 has 2 divisors, whose sum is σ = 28572840. Its totient is φ = 28572838.

The previous prime is 28572823. The next prime is 28572847. The reversal of 28572839 is 93827582.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28572839 - 2⁴ = 28572823 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28572839.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28572809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14286419 + 14286420.

It is an arithmetic number, because the mean of its divisors is an integer number (14286420).

Almost surely, 2^28572839 is an apocalyptic number.

28572839 is a deficient number, since it is larger than the sum of its proper divisors (1).

28572839 is an equidigital number, since it uses as much as digits as its factorization.

28572839 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 241920, while the sum is 44.

The square root of 28572839 is about 5345.3567701324. The cubic root of 28572839 is about 305.7157391198.

The spelling of 28572839 in words is "twenty-eight million, five hundred seventy-two thousand, eight hundred thirty-nine".