28380577 has 2 divisors, whose sum is σ = 28380578. Its totient is φ = 28380576.

The previous prime is 28380571. The next prime is 28380581. The reversal of 28380577 is 77508382.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17648401 + 10732176 = 4201^2 + 3276^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28380577 is a prime.

It is not a weakly prime, because it can be changed into another prime (28380571) 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, 14190288 + 14190289.

It is an arithmetic number, because the mean of its divisors is an integer number (14190289).

Almost surely, 2^28380577 is an apocalyptic number.

It is an amenable number.

28380577 is a deficient number, since it is larger than the sum of its proper divisors (1).

28380577 is an equidigital number, since it uses as much as digits as its factorization.

28380577 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 94080, while the sum is 40.

The square root of 28380577 is about 5327.3423956040. The cubic root of 28380577 is about 305.0284914708.

The spelling of 28380577 in words is "twenty-eight million, three hundred eighty thousand, five hundred seventy-seven".