28840001 has 2 divisors, whose sum is σ = 28840002. Its totient is φ = 28840000.

The previous prime is 28839991. The next prime is 28840027. The reversal of 28840001 is 10004882.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25603600 + 3236401 = 5060^2 + 1799^2 .

It is a cyclic number.

It is not a de Polignac number, because 28840001 - 2¹⁰ = 28838977 is a prime.

It is not a weakly prime, because it can be changed into another prime (28840051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14420000 + 14420001.

It is an arithmetic number, because the mean of its divisors is an integer number (14420001).

Almost surely, 2^28840001 is an apocalyptic number.

It is an amenable number.

28840001 is a deficient number, since it is larger than the sum of its proper divisors (1).

28840001 is an equidigital number, since it uses as much as digits as its factorization.

28840001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 512, while the sum is 23.

The square root of 28840001 is about 5370.2887259439. The cubic root of 28840001 is about 306.6656200080.

Adding to 28840001 its reverse (10004882), we get a palindrome (38844883).

The spelling of 28840001 in words is "twenty-eight million, eight hundred forty thousand, one".