28105913265 has 16 divisors (see below), whose sum is σ = 44989890048. Its totient is φ = 14983010816.

The previous prime is 28105913261. The next prime is 28105913299. The reversal of 28105913265 is 56231950182.

It is a cyclic number.

It is not a de Polignac number, because 28105913265 - 2² = 28105913261 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28105913261) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 391392 + ... + 457601.

It is an arithmetic number, because the mean of its divisors is an integer number (2811868128).

Almost surely, 2^28105913265 is an apocalyptic number.

It is an amenable number.

28105913265 is a deficient number, since it is larger than the sum of its proper divisors (16883976783).

28105913265 is a wasteful number, since it uses less digits than its factorization.

28105913265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 851208.

The product of its (nonzero) digits is 129600, while the sum is 42.

The spelling of 28105913265 in words is "twenty-eight billion, one hundred five million, nine hundred thirteen thousand, two hundred sixty-five".