28661011 has 2 divisors, whose sum is σ = 28661012. Its totient is φ = 28661010.

The previous prime is 28660999. The next prime is 28661021. The reversal of 28661011 is 11016682.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28661011 - 2¹¹ = 28658963 is a prime.

It is not a weakly prime, because it can be changed into another prime (28661021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14330505 + 14330506.

It is an arithmetic number, because the mean of its divisors is an integer number (14330506).

Almost surely, 2^28661011 is an apocalyptic number.

28661011 is a deficient number, since it is larger than the sum of its proper divisors (1).

28661011 is an equidigital number, since it uses as much as digits as its factorization.

28661011 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 28661011 is about 5353.5979490432. The cubic root of 28661011 is about 306.0298823111.

Adding to 28661011 its reverse (11016682), we get a palindrome (39677693).

The spelling of 28661011 in words is "twenty-eight million, six hundred sixty-one thousand, eleven".