28722329 has 2 divisors, whose sum is σ = 28722330. Its totient is φ = 28722328.

The previous prime is 28722313. The next prime is 28722349. The reversal of 28722329 is 92322782.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27667600 + 1054729 = 5260^2 + 1027^2 .

It is a cyclic number.

It is not a de Polignac number, because 28722329 - 2⁴ = 28722313 is a prime.

It is not a weakly prime, because it can be changed into another prime (28722349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14361164 + 14361165.

It is an arithmetic number, because the mean of its divisors is an integer number (14361165).

Almost surely, 2^28722329 is an apocalyptic number.

It is an amenable number.

28722329 is a deficient number, since it is larger than the sum of its proper divisors (1).

28722329 is an equidigital number, since it uses as much as digits as its factorization.

28722329 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24192, while the sum is 35.

The square root of 28722329 is about 5359.3216921547. The cubic root of 28722329 is about 306.2479692216.

The spelling of 28722329 in words is "twenty-eight million, seven hundred twenty-two thousand, three hundred twenty-nine".