28078604347 has 4 divisors (see below), whose sum is σ = 28081635120. Its totient is φ = 28075573576.

The previous prime is 28078604293. The next prime is 28078604399. The reversal of 28078604347 is 74340687082.

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

It is a cyclic number.

It is not a de Polignac number, because 28078604347 - 2¹⁵ = 28078571579 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28078604347.

It is not an unprimeable number, because it can be changed into a prime (28078664347) 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, 1501447 + ... + 1520032.

It is an arithmetic number, because the mean of its divisors is an integer number (7020408780).

Almost surely, 2^28078604347 is an apocalyptic number.

28078604347 is a deficient number, since it is larger than the sum of its proper divisors (3030773).

28078604347 is an equidigital number, since it uses as much as digits as its factorization.

28078604347 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3030772.

The product of its (nonzero) digits is 1806336, while the sum is 49.

The spelling of 28078604347 in words is "twenty-eight billion, seventy-eight million, six hundred four thousand, three hundred forty-seven".