28752239 has 2 divisors, whose sum is σ = 28752240. Its totient is φ = 28752238.

The previous prime is 28752211. The next prime is 28752257. The reversal of 28752239 is 93225782.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28752239 - 2¹⁶ = 28686703 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28752259) 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, 14376119 + 14376120.

It is an arithmetic number, because the mean of its divisors is an integer number (14376120).

Almost surely, 2^28752239 is an apocalyptic number.

28752239 is a deficient number, since it is larger than the sum of its proper divisors (1).

28752239 is an equidigital number, since it uses as much as digits as its factorization.

28752239 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 60480, while the sum is 38.

The square root of 28752239 is about 5362.1114311435. Note that the first 3 decimals coincide. The cubic root of 28752239 is about 306.3542361269.

The spelling of 28752239 in words is "twenty-eight million, seven hundred fifty-two thousand, two hundred thirty-nine".