28344731 has 2 divisors, whose sum is σ = 28344732. Its totient is φ = 28344730.

The previous prime is 28344709. The next prime is 28344739. The reversal of 28344731 is 13744382.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28344731 is a prime.

It is a super-2 number, since 2×28344731² = 1606847550924722, which contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (28344739) 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, 14172365 + 14172366.

It is an arithmetic number, because the mean of its divisors is an integer number (14172366).

Almost surely, 2^28344731 is an apocalyptic number.

28344731 is a deficient number, since it is larger than the sum of its proper divisors (1).

28344731 is an equidigital number, since it uses as much as digits as its factorization.

28344731 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16128, while the sum is 32.

The square root of 28344731 is about 5323.9769909345. The cubic root of 28344731 is about 304.9000156010.

The spelling of 28344731 in words is "twenty-eight million, three hundred forty-four thousand, seven hundred thirty-one".