29668721 has 2 divisors, whose sum is σ = 29668722. Its totient is φ = 29668720.

The previous prime is 29668697. The next prime is 29668759. The reversal of 29668721 is 12786692.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15523600 + 14145121 = 3940^2 + 3761^2 .

It is a cyclic number.

It is not a de Polignac number, because 29668721 - 2⁶ = 29668657 is a prime.

It is not a weakly prime, because it can be changed into another prime (29665721) 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, 14834360 + 14834361.

It is an arithmetic number, because the mean of its divisors is an integer number (14834361).

Almost surely, 2^29668721 is an apocalyptic number.

It is an amenable number.

29668721 is a deficient number, since it is larger than the sum of its proper divisors (1).

29668721 is an equidigital number, since it uses as much as digits as its factorization.

29668721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72576, while the sum is 41.

The square root of 29668721 is about 5446.9001275955. The cubic root of 29668721 is about 309.5752803222.

The spelling of 29668721 in words is "twenty-nine million, six hundred sixty-eight thousand, seven hundred twenty-one".