28770073 has 4 divisors (see below), whose sum is σ = 28936548. Its totient is φ = 28603600.

The previous prime is 28770067. The next prime is 28770097. The reversal of 28770073 is 37007782.

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

It can be written as a sum of positive squares in 2 ways, for example, as 14047504 + 14722569 = 3748^2 + 3837^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28770073 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 12.

It is not an unprimeable number, because it can be changed into a prime (28770013) 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, 82978 + ... + 83323.

It is an arithmetic number, because the mean of its divisors is an integer number (7234137).

Almost surely, 2^28770073 is an apocalyptic number.

It is an amenable number.

28770073 is a deficient number, since it is larger than the sum of its proper divisors (166475).

28770073 is a wasteful number, since it uses less digits than its factorization.

28770073 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166474.

The product of its (nonzero) digits is 16464, while the sum is 34.

The square root of 28770073 is about 5363.7741376758. The cubic root of 28770073 is about 306.4175632789.

The spelling of 28770073 in words is "twenty-eight million, seven hundred seventy thousand, seventy-three".