28776457 has 2 divisors, whose sum is σ = 28776458. Its totient is φ = 28776456.

The previous prime is 28776443. The next prime is 28776479. The reversal of 28776457 is 75467782.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22099401 + 6677056 = 4701^2 + 2584^2 .

It is a cyclic number.

It is not a de Polignac number, because 28776457 - 2⁷ = 28776329 is a prime.

It is not a weakly prime, because it can be changed into another prime (28776437) 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, 14388228 + 14388229.

It is an arithmetic number, because the mean of its divisors is an integer number (14388229).

Almost surely, 2^28776457 is an apocalyptic number.

It is an amenable number.

28776457 is a deficient number, since it is larger than the sum of its proper divisors (1).

28776457 is an equidigital number, since it uses as much as digits as its factorization.

28776457 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 658560, while the sum is 46.

The square root of 28776457 is about 5364.3692080244. The cubic root of 28776457 is about 306.4402260073.

The spelling of 28776457 in words is "twenty-eight million, seven hundred seventy-six thousand, four hundred fifty-seven".