28776447 has 12 divisors (see below), whose sum is σ = 47504080. Its totient is φ = 16443648.

The previous prime is 28776443. The next prime is 28776457. The reversal of 28776447 is 74467782.

It is not a de Polignac number, because 28776447 - 2² = 28776443 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28776443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 228322 + ... + 228447.

Almost surely, 2^28776447 is an apocalyptic number.

28776447 is a deficient number, since it is larger than the sum of its proper divisors (18727633).

28776447 is a wasteful number, since it uses less digits than its factorization.

28776447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 456782 (or 456779 counting only the distinct ones).

The product of its digits is 526848, while the sum is 45.

The square root of 28776447 is about 5364.3682759482. The cubic root of 28776447 is about 306.4401905107.

The spelling of 28776447 in words is "twenty-eight million, seven hundred seventy-six thousand, four hundred forty-seven".