28078935869 has 4 divisors (see below), whose sum is σ = 28083698496. Its totient is φ = 28074173244.

The previous prime is 28078935823. The next prime is 28078935893. The reversal of 28078935869 is 96853987082.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28078935869 - 2¹⁶ = 28078870333 is a prime.

It is a super-2 number, since 2×28078935869² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28078931869) 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, 2372459 + ... + 2384264.

It is an arithmetic number, because the mean of its divisors is an integer number (7020924624).

Almost surely, 2^28078935869 is an apocalyptic number.

It is an amenable number.

28078935869 is a deficient number, since it is larger than the sum of its proper divisors (4762627).

28078935869 is an equidigital number, since it uses as much as digits as its factorization.

28078935869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4762626.

The product of its (nonzero) digits is 52254720, while the sum is 65.

The spelling of 28078935869 in words is "twenty-eight billion, seventy-eight million, nine hundred thirty-five thousand, eight hundred sixty-nine".