28273864405 has 4 divisors (see below), whose sum is σ = 33928637292. Its totient is φ = 22619091520.

The previous prime is 28273864397. The next prime is 28273864417. The reversal of 28273864405 is 50446837282.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50446837282 = 2 ⋅25223418641.

It can be written as a sum of positive squares in 2 ways, for example, as 13498489489 + 14775374916 = 116183^2 + 121554^2 .

It is not a de Polignac number, because 28273864405 - 2³ = 28273864397 is a prime.

It is a super-2 number, since 2×28273864405² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2827386436 + ... + 2827386445.

It is an arithmetic number, because the mean of its divisors is an integer number (8482159323).

Almost surely, 2^28273864405 is an apocalyptic number.

It is an amenable number.

28273864405 is a deficient number, since it is larger than the sum of its proper divisors (5654772887).

28273864405 is an equidigital number, since it uses as much as digits as its factorization.

28273864405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5654772886.

The product of its (nonzero) digits is 2580480, while the sum is 49.

The spelling of 28273864405 in words is "twenty-eight billion, two hundred seventy-three million, eight hundred sixty-four thousand, four hundred five".