28702073 has 4 divisors (see below), whose sum is σ = 28713828. Its totient is φ = 28690320.

The previous prime is 28702061. The next prime is 28702087. The reversal of 28702073 is 37020782.

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 can be written as a sum of positive squares in 2 ways, for example, as 5968249 + 22733824 = 2443^2 + 4768^2 .

It is a cyclic number.

It is not a de Polignac number, because 28702073 - 2⁸ = 28701817 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28702033) 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, 686 + ... + 7607.

It is an arithmetic number, because the mean of its divisors is an integer number (7178457).

Almost surely, 2^28702073 is an apocalyptic number.

It is an amenable number.

28702073 is a deficient number, since it is larger than the sum of its proper divisors (11755).

28702073 is an equidigital number, since it uses as much as digits as its factorization.

28702073 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11754.

The product of its (nonzero) digits is 4704, while the sum is 29.

The square root of 28702073 is about 5357.4315674584. The cubic root of 28702073 is about 306.1759599994.

The spelling of 28702073 in words is "twenty-eight million, seven hundred two thousand, seventy-three".