28237777 has 2 divisors, whose sum is σ = 28237778. Its totient is φ = 28237776.

The previous prime is 28237757. The next prime is 28237789. The reversal of 28237777 is 77773282.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16941456 + 11296321 = 4116^2 + 3361^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28237777 is a prime.

It is not a weakly prime, because it can be changed into another prime (28237757) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14118888 + 14118889.

It is an arithmetic number, because the mean of its divisors is an integer number (14118889).

Almost surely, 2^28237777 is an apocalyptic number.

It is an amenable number.

28237777 is a deficient number, since it is larger than the sum of its proper divisors (1).

28237777 is an equidigital number, since it uses as much as digits as its factorization.

28237777 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 230496, while the sum is 43.

The square root of 28237777 is about 5313.9229388466. The cubic root of 28237777 is about 304.5160361952.

The spelling of 28237777 in words is "twenty-eight million, two hundred thirty-seven thousand, seven hundred seventy-seven".