28011743 has 4 divisors (see below), whose sum is σ = 28072968. Its totient is φ = 27950520.

The previous prime is 28011721. The next prime is 28011761. The reversal of 28011743 is 34711082.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28011743 - 2¹² = 28007647 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 (28011703) 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 in 3 ways as a sum of consecutive naturals, for example, 29921 + ... + 30842.

It is an arithmetic number, because the mean of its divisors is an integer number (7018242).

Almost surely, 2^28011743 is an apocalyptic number.

28011743 is a deficient number, since it is larger than the sum of its proper divisors (61225).

28011743 is an equidigital number, since it uses as much as digits as its factorization.

28011743 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61224.

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 28011743 is about 5292.6121150147. The cubic root of 28011743 is about 303.7013420453.

The spelling of 28011743 in words is "twenty-eight million, eleven thousand, seven hundred forty-three".