28080223438 has 4 divisors (see below), whose sum is σ = 42120335160. Its totient is φ = 14040111718.

The previous prime is 28080223403. The next prime is 28080223439. The reversal of 28080223438 is 83432208082.

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

It is a self number, because there is not a number n which added to its sum of digits gives 28080223438.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28080223439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7020055858 + ... + 7020055861.

It is an arithmetic number, because the mean of its divisors is an integer number (10530083790).

Almost surely, 2^28080223438 is an apocalyptic number.

28080223438 is a deficient number, since it is larger than the sum of its proper divisors (14040111722).

28080223438 is a wasteful number, since it uses less digits than its factorization.

28080223438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14040111721.

The product of its (nonzero) digits is 147456, while the sum is 40.

The spelling of 28080223438 in words is "twenty-eight billion, eighty million, two hundred twenty-three thousand, four hundred thirty-eight".