28305105261 has 16 divisors (see below), whose sum is σ = 38745305088. Its totient is φ = 18369504000.

The previous prime is 28305105253. The next prime is 28305105263. The reversal of 28305105261 is 16250150382.

It is not a de Polignac number, because 28305105261 - 2³ = 28305105253 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28305105263) 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, 195565 + ... + 307986.

It is an arithmetic number, because the mean of its divisors is an integer number (2421581568).

Almost surely, 2^28305105261 is an apocalyptic number.

It is an amenable number.

28305105261 is a deficient number, since it is larger than the sum of its proper divisors (10440199827).

28305105261 is a wasteful number, since it uses less digits than its factorization.

28305105261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 504052.

The product of its (nonzero) digits is 14400, while the sum is 33.

It can be divided in two parts, 2830510 and 5261, that added together give a triangular number (2835771 = T₂₃₈₁).

The spelling of 28305105261 in words is "twenty-eight billion, three hundred five million, one hundred five thousand, two hundred sixty-one".