28740401 has 2 divisors, whose sum is σ = 28740402. Its totient is φ = 28740400.

The previous prime is 28740389. The next prime is 28740403. The reversal of 28740401 is 10404782.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27050401 + 1690000 = 5201^2 + 1300^2 .

It is a cyclic number.

It is not a de Polignac number, because 28740401 - 2⁶ = 28740337 is a prime.

It is a Sophie Germain prime.

Together with 28740403, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (28740403) 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, 14370200 + 14370201.

It is an arithmetic number, because the mean of its divisors is an integer number (14370201).

Almost surely, 2^28740401 is an apocalyptic number.

It is an amenable number.

28740401 is a deficient number, since it is larger than the sum of its proper divisors (1).

28740401 is an equidigital number, since it uses as much as digits as its factorization.

28740401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1792, while the sum is 26.

The square root of 28740401 is about 5361.0074612893. The cubic root of 28740401 is about 306.3121858448.

The spelling of 28740401 in words is "twenty-eight million, seven hundred forty thousand, four hundred one".