28263709 has 2 divisors, whose sum is σ = 28263710. Its totient is φ = 28263708.

The previous prime is 28263691. The next prime is 28263721. The reversal of 28263709 is 90736282.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26811684 + 1452025 = 5178^2 + 1205^2 .

It is a cyclic number.

It is not a de Polignac number, because 28263709 - 2¹³ = 28255517 is a prime.

It is a super-4 number, since 4×28263709⁴ (a number of 31 digits) contains 4444 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28263769) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14131854 + 14131855.

It is an arithmetic number, because the mean of its divisors is an integer number (14131855).

Almost surely, 2^28263709 is an apocalyptic number.

It is an amenable number.

28263709 is a deficient number, since it is larger than the sum of its proper divisors (1).

28263709 is an equidigital number, since it uses as much as digits as its factorization.

28263709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36288, while the sum is 37.

The square root of 28263709 is about 5316.3623841871. The cubic root of 28263709 is about 304.6092245245.

The spelling of 28263709 in words is "twenty-eight million, two hundred sixty-three thousand, seven hundred nine".