28185709441 has 16 divisors (see below), whose sum is σ = 28617397200. Its totient is φ = 27757836288.

The previous prime is 28185709417. The next prime is 28185709481. The reversal of 28185709441 is 14490758182.

It can be written as a sum of positive squares in 8 ways, for example, as 37258816 + 28148450625 = 6104^2 + 167775^2 .

It is a cyclic number.

It is not a de Polignac number, because 28185709441 - 2¹¹ = 28185707393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28185709411) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13890415 + ... + 13892443.

It is an arithmetic number, because the mean of its divisors is an integer number (1788587325).

Almost surely, 2^28185709441 is an apocalyptic number.

It is an amenable number.

28185709441 is a deficient number, since it is larger than the sum of its proper divisors (431687759).

28185709441 is a wasteful number, since it uses less digits than its factorization.

28185709441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2868.

The product of its (nonzero) digits is 645120, while the sum is 49.

The spelling of 28185709441 in words is "twenty-eight billion, one hundred eighty-five million, seven hundred nine thousand, four hundred forty-one".