28071441 has 10 divisors (see below), whose sum is σ = 41934002. Its totient is φ = 18714240.

The previous prime is 28071413. The next prime is 28071469. The reversal of 28071441 is 14417082.

It is an interprime number because it is at equal distance from previous prime (28071413) and next prime (28071469).

It can be written as a sum of positive squares in only one way, i.e., 23970816 + 4100625 = 4896^2 + 2025^2 .

It is not a de Polignac number, because 28071441 - 2⁵ = 28071409 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28071481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 173200 + ... + 173361.

Almost surely, 2^28071441 is an apocalyptic number.

It is an amenable number.

28071441 is a deficient number, since it is larger than the sum of its proper divisors (13862561).

28071441 is an equidigital number, since it uses as much as digits as its factorization.

28071441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 346573 (or 346564 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 27.

The square root of 28071441 is about 5298.2488616523. The cubic root of 28071441 is about 303.9169361299.

The spelling of 28071441 in words is "twenty-eight million, seventy-one thousand, four hundred forty-one".