28776443 has 2 divisors, whose sum is σ = 28776444. Its totient is φ = 28776442.

The previous prime is 28776437. The next prime is 28776457. The reversal of 28776443 is 34467782.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28776443 - 2⁶ = 28776379 is a prime.

It is equal to p_1786676 and since 28776443 and 1786676 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28776443.

It is not a weakly prime, because it can be changed into another prime (28776043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14388221 + 14388222.

It is an arithmetic number, because the mean of its divisors is an integer number (14388222).

Almost surely, 2^28776443 is an apocalyptic number.

28776443 is a deficient number, since it is larger than the sum of its proper divisors (1).

28776443 is an equidigital number, since it uses as much as digits as its factorization.

28776443 is an evil number, because the sum of its binary digits is even.

The product of its digits is 225792, while the sum is 41.

The square root of 28776443 is about 5364.3679031178. The cubic root of 28776443 is about 306.4401763120.

The spelling of 28776443 in words is "twenty-eight million, seven hundred seventy-six thousand, four hundred forty-three".