28232401 has 2 divisors, whose sum is σ = 28232402. Its totient is φ = 28232400.

The previous prime is 28232387. The next prime is 28232419. The reversal of 28232401 is 10423282.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22467600 + 5764801 = 4740^2 + 2401^2 .

It is a cyclic number.

It is not a de Polignac number, because 28232401 - 2⁷ = 28232273 is a prime.

It is not a weakly prime, because it can be changed into another prime (28232471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14116200 + 14116201.

It is an arithmetic number, because the mean of its divisors is an integer number (14116201).

Almost surely, 2^28232401 is an apocalyptic number.

28232401 is the 3361-st centered pentagonal number.

It is an amenable number.

28232401 is a deficient number, since it is larger than the sum of its proper divisors (1).

28232401 is an equidigital number, since it uses as much as digits as its factorization.

28232401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 28232401 is about 5313.4170737859. The cubic root of 28232401 is about 304.4967100503.

Adding to 28232401 its reverse (10423282), we get a palindrome (38655683).

The spelling of 28232401 in words is "twenty-eight million, two hundred thirty-two thousand, four hundred one".