28730743 has 4 divisors (see below), whose sum is σ = 28741480. Its totient is φ = 28720008.

The previous prime is 28730729. The next prime is 28730761. The reversal of 28730743 is 34703782.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 28730743 - 2⁵ = 28730711 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28730699 and 28730708.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28730773) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2248 + ... + 7906.

It is an arithmetic number, because the mean of its divisors is an integer number (7185370).

Almost surely, 2^28730743 is an apocalyptic number.

28730743 is a deficient number, since it is larger than the sum of its proper divisors (10737).

28730743 is an equidigital number, since it uses as much as digits as its factorization.

28730743 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10736.

The product of its (nonzero) digits is 28224, while the sum is 34.

The square root of 28730743 is about 5360.1066220739. The cubic root of 28730743 is about 306.2778706830.

The spelling of 28730743 in words is "twenty-eight million, seven hundred thirty thousand, seven hundred forty-three".