28077109 has 6 divisors (see below), whose sum is σ = 28258710. Its totient is φ = 27896616.

The previous prime is 28077083. The next prime is 28077131. The reversal of 28077109 is 90177082.

It can be written as a sum of positive squares in only one way, i.e., 19166884 + 8910225 = 4378^2 + 2985^2 .

It is not a de Polignac number, because 28077109 - 2⁷ = 28076981 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 (28077509) 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, 39247 + ... + 39955.

It is an arithmetic number, because the mean of its divisors is an integer number (4709785).

Almost surely, 2^28077109 is an apocalyptic number.

It is an amenable number.

28077109 is a deficient number, since it is larger than the sum of its proper divisors (181601).

28077109 is an frugal number, since it uses more digits than its factorization.

28077109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1107 (or 908 counting only the distinct ones).

The product of its (nonzero) digits is 7056, while the sum is 34.

The square root of 28077109 is about 5298.7837283664. The cubic root of 28077109 is about 303.9373897203.

The spelling of 28077109 in words is "twenty-eight million, seventy-seven thousand, one hundred nine".