28272401 has 2 divisors, whose sum is σ = 28272402. Its totient is φ = 28272400.

The previous prime is 28272397. The next prime is 28272443. The reversal of 28272401 is 10427282.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20566225 + 7706176 = 4535^2 + 2776^2 .

It is a cyclic number.

It is not a de Polignac number, because 28272401 - 2² = 28272397 is a prime.

It is not a weakly prime, because it can be changed into another prime (28272481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14136200 + 14136201.

It is an arithmetic number, because the mean of its divisors is an integer number (14136201).

Almost surely, 2^28272401 is an apocalyptic number.

It is an amenable number.

28272401 is a deficient number, since it is larger than the sum of its proper divisors (1).

28272401 is an equidigital number, since it uses as much as digits as its factorization.

28272401 is an evil number, because the sum of its binary digits is even.

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

The square root of 28272401 is about 5317.1797975995. The cubic root of 28272401 is about 304.6404470368.

Adding to 28272401 its reverse (10427282), we get a palindrome (38699683).

The spelling of 28272401 in words is "twenty-eight million, two hundred seventy-two thousand, four hundred one".