28980481 has 4 divisors (see below), whose sum is σ = 29687364. Its totient is φ = 28273600.

The previous prime is 28980463. The next prime is 28980517. The reversal of 28980481 is 18408982.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18408982 = 2 ⋅9204491.

It can be written as a sum of positive squares in 2 ways, for example, as 12852225 + 16128256 = 3585^2 + 4016^2 .

It is not a de Polignac number, because 28980481 - 2⁵ = 28980449 is a prime.

It is a super-2 number, since 2×28980481² = 1679736557982722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28980431) 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 3 ways as a sum of consecutive naturals, for example, 353380 + ... + 353461.

It is an arithmetic number, because the mean of its divisors is an integer number (7421841).

Almost surely, 2^28980481 is an apocalyptic number.

It is an amenable number.

28980481 is a deficient number, since it is larger than the sum of its proper divisors (706883).

28980481 is an equidigital number, since it uses as much as digits as its factorization.

28980481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 706882.

The product of its (nonzero) digits is 36864, while the sum is 40.

The square root of 28980481 is about 5383.3522084292. The cubic root of 28980481 is about 307.1627377278.

The spelling of 28980481 in words is "twenty-eight million, nine hundred eighty thousand, four hundred eighty-one".