28088078797 has 4 divisors (see below), whose sum is σ = 28336645980. Its totient is φ = 27839511616.

The previous prime is 28088078771. The next prime is 28088078807. The reversal of 28088078797 is 79787088082.

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 12336322761 + 15751756036 = 111069^2 + 125506^2 .

It is a cyclic number.

It is not a de Polignac number, because 28088078797 - 2¹¹ = 28088076749 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 (28088078297) 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, 124283422 + ... + 124283647.

It is an arithmetic number, because the mean of its divisors is an integer number (7084161495).

Almost surely, 2^28088078797 is an apocalyptic number.

It is an amenable number.

28088078797 is a deficient number, since it is larger than the sum of its proper divisors (248567183).

28088078797 is a wasteful number, since it uses less digits than its factorization.

28088078797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 248567182.

The product of its (nonzero) digits is 25288704, while the sum is 64.

The spelling of 28088078797 in words is "twenty-eight billion, eighty-eight million, seventy-eight thousand, seven hundred ninety-seven".