28781041 has 2 divisors, whose sum is σ = 28781042. Its totient is φ = 28781040.

The previous prime is 28781023. The next prime is 28781047. The reversal of 28781041 is 14018782.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24354225 + 4426816 = 4935^2 + 2104^2 .

It is a cyclic number.

It is not a de Polignac number, because 28781041 - 2⁵ = 28781009 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28780994 and 28781012.

It is not a weakly prime, because it can be changed into another prime (28781047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14390520 + 14390521.

It is an arithmetic number, because the mean of its divisors is an integer number (14390521).

Almost surely, 2^28781041 is an apocalyptic number.

It is an amenable number.

28781041 is a deficient number, since it is larger than the sum of its proper divisors (1).

28781041 is an equidigital number, since it uses as much as digits as its factorization.

28781041 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 31.

The square root of 28781041 is about 5364.7964546663. The cubic root of 28781041 is about 306.4564968013.

The spelling of 28781041 in words is "twenty-eight million, seven hundred eighty-one thousand, forty-one".