28447157 has 2 divisors, whose sum is σ = 28447158. Its totient is φ = 28447156.

The previous prime is 28447063. The next prime is 28447163. The reversal of 28447157 is 75174482.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15673681 + 12773476 = 3959^2 + 3574^2 .

It is a cyclic number.

It is not a de Polignac number, because 28447157 - 2¹⁰ = 28446133 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28447157.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28447957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14223578 + 14223579.

It is an arithmetic number, because the mean of its divisors is an integer number (14223579).

Almost surely, 2^28447157 is an apocalyptic number.

It is an amenable number.

28447157 is a deficient number, since it is larger than the sum of its proper divisors (1).

28447157 is an equidigital number, since it uses as much as digits as its factorization.

28447157 is an evil number, because the sum of its binary digits is even.

The product of its digits is 62720, while the sum is 38.

The square root of 28447157 is about 5333.5876293542. The cubic root of 28447157 is about 305.2668344797.

It can be divided in two parts, 2844 and 7157, that added together give a palindrome (10001).

The spelling of 28447157 in words is "twenty-eight million, four hundred forty-seven thousand, one hundred fifty-seven".