28788073 has 4 divisors (see below), whose sum is σ = 28937428. Its totient is φ = 28638720.

The previous prime is 28788049. The next prime is 28788077. The reversal of 28788073 is 37088782.

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 16621929 + 12166144 = 4077^2 + 3488^2 .

It is a cyclic number.

It is not a de Polignac number, because 28788073 - 2²¹ = 26690921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28788077) 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, 74388 + ... + 74773.

It is an arithmetic number, because the mean of its divisors is an integer number (7234357).

Almost surely, 2^28788073 is an apocalyptic number.

It is an amenable number.

28788073 is a deficient number, since it is larger than the sum of its proper divisors (149355).

28788073 is a wasteful number, since it uses less digits than its factorization.

28788073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149354.

The product of its (nonzero) digits is 150528, while the sum is 43.

The square root of 28788073 is about 5365.4517983111. The cubic root of 28788073 is about 306.4814533529.

The spelling of 28788073 in words is "twenty-eight million, seven hundred eighty-eight thousand, seventy-three".