28816961 has 2 divisors, whose sum is σ = 28816962. Its totient is φ = 28816960.

The previous prime is 28816943. The next prime is 28816967. The reversal of 28816961 is 16961882.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26460736 + 2356225 = 5144^2 + 1535^2 .

It is a cyclic number.

It is not a de Polignac number, because 28816961 - 2⁶ = 28816897 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (28816967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14408480 + 14408481.

It is an arithmetic number, because the mean of its divisors is an integer number (14408481).

Almost surely, 2^28816961 is an apocalyptic number.

It is an amenable number.

28816961 is a deficient number, since it is larger than the sum of its proper divisors (1).

28816961 is an equidigital number, since it uses as much as digits as its factorization.

28816961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 41472, while the sum is 41.

The square root of 28816961 is about 5368.1431612803. The cubic root of 28816961 is about 306.5839341779.

The spelling of 28816961 in words is "twenty-eight million, eight hundred sixteen thousand, nine hundred sixty-one".