28340743 has 8 divisors (see below), whose sum is σ = 29872800. Its totient is φ = 26845728.

The previous prime is 28340681. The next prime is 28340749. The reversal of 28340743 is 34704382.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28340743 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 (28340749) 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 in 7 ways as a sum of consecutive naturals, for example, 7683 + ... + 10756.

It is an arithmetic number, because the mean of its divisors is an integer number (3734100).

Almost surely, 2^28340743 is an apocalyptic number.

28340743 is a deficient number, since it is larger than the sum of its proper divisors (1532057).

28340743 is a wasteful number, since it uses less digits than its factorization.

28340743 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18521.

The product of its (nonzero) digits is 16128, while the sum is 31.

The square root of 28340743 is about 5323.6024457129. The cubic root of 28340743 is about 304.8857154913.

The spelling of 28340743 in words is "twenty-eight million, three hundred forty thousand, seven hundred forty-three".