28432661 has 2 divisors, whose sum is σ = 28432662. Its totient is φ = 28432660.

The previous prime is 28432643. The next prime is 28432699. The reversal of 28432661 is 16623482.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18541636 + 9891025 = 4306^2 + 3145^2 .

It is a cyclic number.

It is not a de Polignac number, because 28432661 - 2⁶ = 28432597 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28432601) 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, 14216330 + 14216331.

It is an arithmetic number, because the mean of its divisors is an integer number (14216331).

Almost surely, 2^28432661 is an apocalyptic number.

It is an amenable number.

28432661 is a deficient number, since it is larger than the sum of its proper divisors (1).

28432661 is an equidigital number, since it uses as much as digits as its factorization.

28432661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13824, while the sum is 32.

The square root of 28432661 is about 5332.2285209844. The cubic root of 28432661 is about 305.2149734109.

The spelling of 28432661 in words is "twenty-eight million, four hundred thirty-two thousand, six hundred sixty-one".