28445401 has 2 divisors, whose sum is σ = 28445402. Its totient is φ = 28445400.

The previous prime is 28445371. The next prime is 28445429. The reversal of 28445401 is 10454482.

It is an a-pointer prime, because the next prime (28445429) can be obtained adding 28445401 to its sum of digits (28).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26625600 + 1819801 = 5160^2 + 1349^2 .

It is a cyclic number.

It is not a de Polignac number, because 28445401 - 2²³ = 20056793 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28445401.

It is not a weakly prime, because it can be changed into another prime (28445101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14222700 + 14222701.

It is an arithmetic number, because the mean of its divisors is an integer number (14222701).

Almost surely, 2^28445401 is an apocalyptic number.

It is an amenable number.

28445401 is a deficient number, since it is larger than the sum of its proper divisors (1).

28445401 is an equidigital number, since it uses as much as digits as its factorization.

28445401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5120, while the sum is 28.

The square root of 28445401 is about 5333.4230096627. The cubic root of 28445401 is about 305.2605531303.

Adding to 28445401 its reverse (10454482), we get a palindrome (38899883).

The spelling of 28445401 in words is "twenty-eight million, four hundred forty-five thousand, four hundred one".