28478441 has 2 divisors, whose sum is σ = 28478442. Its totient is φ = 28478440.

The previous prime is 28478431. The next prime is 28478467. The reversal of 28478441 is 14487482.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18524416 + 9954025 = 4304^2 + 3155^2 .

It is a cyclic number.

It is not a de Polignac number, because 28478441 - 2¹⁰ = 28477417 is a prime.

It is a super-2 number, since 2×28478441² = 1622043203580962, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 28478395 and 28478404.

It is not a weakly prime, because it can be changed into another prime (28478431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14239220 + 14239221.

It is an arithmetic number, because the mean of its divisors is an integer number (14239221).

Almost surely, 2^28478441 is an apocalyptic number.

It is an amenable number.

28478441 is a deficient number, since it is larger than the sum of its proper divisors (1).

28478441 is an equidigital number, since it uses as much as digits as its factorization.

28478441 is an evil number, because the sum of its binary digits is even.

The product of its digits is 57344, while the sum is 38.

The square root of 28478441 is about 5336.5195586637. The cubic root of 28478441 is about 305.3786964959.

The spelling of 28478441 in words is "twenty-eight million, four hundred seventy-eight thousand, four hundred forty-one".