28390001 has 2 divisors, whose sum is σ = 28390002. Its totient is φ = 28390000.

The previous prime is 28389979. The next prime is 28390003. The reversal of 28390001 is 10009382.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17631601 + 10758400 = 4199^2 + 3280^2 .

It is a cyclic number.

It is not a de Polignac number, because 28390001 - 2¹⁴ = 28373617 is a prime.

Together with 28390003, 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 (28390003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14195000 + 14195001.

It is an arithmetic number, because the mean of its divisors is an integer number (14195001).

Almost surely, 2^28390001 is an apocalyptic number.

It is an amenable number.

28390001 is a deficient number, since it is larger than the sum of its proper divisors (1).

28390001 is an equidigital number, since it uses as much as digits as its factorization.

28390001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 28390001 is about 5328.2268157427. The cubic root of 28390001 is about 305.0622501265.

Adding to 28390001 its reverse (10009382), we get a palindrome (38399383).

The spelling of 28390001 in words is "twenty-eight million, three hundred ninety thousand, one".