28531819 has 2 divisors, whose sum is σ = 28531820. Its totient is φ = 28531818.

The previous prime is 28531817. The next prime is 28531823. The reversal of 28531819 is 91813582.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28531819 - 2¹ = 28531817 is a prime.

It is a super-2 number, since 2×28531819² = 1628129390897522, which contains 22 as substring.

Together with 28531817, 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 (28531813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14265909 + 14265910.

It is an arithmetic number, because the mean of its divisors is an integer number (14265910).

Almost surely, 2^28531819 is an apocalyptic number.

28531819 is a deficient number, since it is larger than the sum of its proper divisors (1).

28531819 is an equidigital number, since it uses as much as digits as its factorization.

28531819 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17280, while the sum is 37.

The square root of 28531819 is about 5341.5184170795. The cubic root of 28531819 is about 305.5693709138.

The spelling of 28531819 in words is "twenty-eight million, five hundred thirty-one thousand, eight hundred nineteen".