28409405265 has 32 divisors (see below), whose sum is σ = 50512573440. Its totient is φ = 15149593728.

The previous prime is 28409405239. The next prime is 28409405291. The reversal of 28409405265 is 56250490482.

28409405265 is a `hidden beast` number, since 2 + 84 + 0 + 9 + 40 + 526 + 5 = 666.

It is an interprime number because it is at equal distance from previous prime (28409405239) and next prime (28409405291).

It is not a de Polignac number, because 28409405265 - 2¹⁴ = 28409388881 is a prime.

It is a super-2 number, since 2×28409405265² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 28409405265.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1923549 + ... + 1938261.

It is an arithmetic number, because the mean of its divisors is an integer number (1578517920).

Almost surely, 2^28409405265 is an apocalyptic number.

It is an amenable number.

28409405265 is a deficient number, since it is larger than the sum of its proper divisors (22103168175).

28409405265 is a wasteful number, since it uses less digits than its factorization.

28409405265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29030 (or 29024 counting only the distinct ones).

The product of its (nonzero) digits is 691200, while the sum is 45.

The spelling of 28409405265 in words is "twenty-eight billion, four hundred nine million, four hundred five thousand, two hundred sixty-five".