28609777 has 6 divisors (see below), whose sum is σ = 33280818. Its totient is φ = 24522624.

The previous prime is 28609751. The next prime is 28609813. The reversal of 28609777 is 77790682.

It can be written as a sum of positive squares in only one way, i.e., 19633761 + 8976016 = 4431^2 + 2996^2 .

It is not a de Polignac number, because 28609777 - 2¹⁹ = 28085489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28609727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 291888 + ... + 291985.

It is an arithmetic number, because the mean of its divisors is an integer number (5546803).

Almost surely, 2^28609777 is an apocalyptic number.

It is an amenable number.

28609777 is a deficient number, since it is larger than the sum of its proper divisors (4671041).

28609777 is an equidigital number, since it uses as much as digits as its factorization.

28609777 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 583887 (or 583880 counting only the distinct ones).

The product of its (nonzero) digits is 296352, while the sum is 46.

The square root of 28609777 is about 5348.8108024121. The cubic root of 28609777 is about 305.8474220474.

The spelling of 28609777 in words is "twenty-eight million, six hundred nine thousand, seven hundred seventy-seven".