28061369 has 12 divisors (see below), whose sum is σ = 32730084. Its totient is φ = 23988384.

The previous prime is 28061359. The next prime is 28061377. The reversal of 28061369 is 96316082.

It can be written as a sum of positive squares in 2 ways, for example, as 15366400 + 12694969 = 3920^2 + 3563^2 .

It is not a de Polignac number, because 28061369 - 2¹⁶ = 27995833 is a prime.

It is a super-2 number, since 2×28061369² = 1574880860308322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28061359) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 31559 + ... + 32435.

It is an arithmetic number, because the mean of its divisors is an integer number (2727507).

Almost surely, 2^28061369 is an apocalyptic number.

It is an amenable number.

28061369 is a deficient number, since it is larger than the sum of its proper divisors (4668715).

28061369 is an equidigital number, since it uses as much as digits as its factorization.

28061369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1544 (or 1537 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 28061369 is about 5297.2982736486. The cubic root of 28061369 is about 303.8805834354.

The spelling of 28061369 in words is "twenty-eight million, sixty-one thousand, three hundred sixty-nine".