28078848013 has 4 divisors (see below), whose sum is σ = 28125568828. Its totient is φ = 28032127200.

The previous prime is 28078847921. The next prime is 28078848019. The reversal of 28078848013 is 31084887082.

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 16961676169 + 11117171844 = 130237^2 + 105438^2 .

It is a cyclic number.

It is not a de Polignac number, because 28078848013 - 2¹³ = 28078839821 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28078848019) 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, 23359506 + ... + 23360707.

It is an arithmetic number, because the mean of its divisors is an integer number (7031392207).

Almost surely, 2^28078848013 is an apocalyptic number.

It is an amenable number.

28078848013 is a deficient number, since it is larger than the sum of its proper divisors (46720815).

28078848013 is an equidigital number, since it uses as much as digits as its factorization.

28078848013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46720814.

The product of its (nonzero) digits is 688128, while the sum is 49.

The spelling of 28078848013 in words is "twenty-eight billion, seventy-eight million, eight hundred forty-eight thousand, thirteen".