28223651 has 2 divisors, whose sum is σ = 28223652. Its totient is φ = 28223650.

The previous prime is 28223647. The next prime is 28223659. The reversal of 28223651 is 15632282.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28223651 - 2² = 28223647 is a prime.

It is not a weakly prime, because it can be changed into another prime (28223659) 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, 14111825 + 14111826.

It is an arithmetic number, because the mean of its divisors is an integer number (14111826).

Almost surely, 2^28223651 is an apocalyptic number.

28223651 is a deficient number, since it is larger than the sum of its proper divisors (1).

28223651 is an equidigital number, since it uses as much as digits as its factorization.

28223651 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5760, while the sum is 29.

The square root of 28223651 is about 5312.5936227045. The cubic root of 28223651 is about 304.4652494894.

The spelling of 28223651 in words is "twenty-eight million, two hundred twenty-three thousand, six hundred fifty-one".