28079581 has 8 divisors (see below), whose sum is σ = 28625400. Its totient is φ = 27536640.

The previous prime is 28079533. The next prime is 28079591. The reversal of 28079581 is 18597082.

It can be written as a sum of positive squares in 4 ways, for example, as 422500 + 27657081 = 650^2 + 5259^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28079581 - 2¹⁹ = 27555293 is a prime.

It is a super-2 number, since 2×28079581² = 1576925738271122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28079591) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34305 + ... + 35113.

It is an arithmetic number, because the mean of its divisors is an integer number (3578175).

Almost surely, 2^28079581 is an apocalyptic number.

It is an amenable number.

28079581 is a deficient number, since it is larger than the sum of its proper divisors (545819).

28079581 is an equidigital number, since it uses as much as digits as its factorization.

28079581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1439.

The product of its (nonzero) digits is 40320, while the sum is 40.

The square root of 28079581 is about 5299.0169843094. The cubic root of 28079581 is about 303.9463093373.

The spelling of 28079581 in words is "twenty-eight million, seventy-nine thousand, five hundred eighty-one".