28720441 has 2 divisors, whose sum is σ = 28720442. Its totient is φ = 28720440.

The previous prime is 28720427. The next prime is 28720451. The reversal of 28720441 is 14402782.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28355625 + 364816 = 5325^2 + 604^2 .

It is a cyclic number.

It is not a de Polignac number, because 28720441 - 2⁷ = 28720313 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28720451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14360220 + 14360221.

It is an arithmetic number, because the mean of its divisors is an integer number (14360221).

Almost surely, 2^28720441 is an apocalyptic number.

It is an amenable number.

28720441 is a deficient number, since it is larger than the sum of its proper divisors (1).

28720441 is an equidigital number, since it uses as much as digits as its factorization.

28720441 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3584, while the sum is 28.

The square root of 28720441 is about 5359.1455475663. The cubic root of 28720441 is about 306.2412588925.

It can be divided in two parts, 28720 and 441, that added together give a triangular number (29161 = T₂₄₁).

The spelling of 28720441 in words is "twenty-eight million, seven hundred twenty thousand, four hundred forty-one".