28732001 has 2 divisors, whose sum is σ = 28732002. Its totient is φ = 28732000.

The previous prime is 28731977. The next prime is 28732003. The reversal of 28732001 is 10023782.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28729600 + 2401 = 5360^2 + 49^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28732001 is a prime.

Together with 28732003, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28732003) 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, 14366000 + 14366001.

It is an arithmetic number, because the mean of its divisors is an integer number (14366001).

Almost surely, 2^28732001 is an apocalyptic number.

It is an amenable number.

28732001 is a deficient number, since it is larger than the sum of its proper divisors (1).

28732001 is an equidigital number, since it uses as much as digits as its factorization.

28732001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 28732001 is about 5360.2239692013. The cubic root of 28732001 is about 306.2823408301.

Adding to 28732001 its reverse (10023782), we get a palindrome (38755783).

The spelling of 28732001 in words is "twenty-eight million, seven hundred thirty-two thousand, one".