28530961 has 2 divisors, whose sum is σ = 28530962. Its totient is φ = 28530960.

The previous prime is 28530937. The next prime is 28530979. The reversal of 28530961 is 16903582.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25401600 + 3129361 = 5040^2 + 1769^2 .

It is a cyclic number.

It is not a de Polignac number, because 28530961 - 2⁹ = 28530449 is a prime.

It is not a weakly prime, because it can be changed into another prime (28530911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14265480 + 14265481.

It is an arithmetic number, because the mean of its divisors is an integer number (14265481).

Almost surely, 2^28530961 is an apocalyptic number.

It is an amenable number.

28530961 is a deficient number, since it is larger than the sum of its proper divisors (1).

28530961 is an equidigital number, since it uses as much as digits as its factorization.

28530961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 28530961 is about 5341.4381022343. The cubic root of 28530961 is about 305.5663078873.

The spelling of 28530961 in words is "twenty-eight million, five hundred thirty thousand, nine hundred sixty-one".