28438447 has 4 divisors (see below), whose sum is σ = 28613080. Its totient is φ = 28263816.

The previous prime is 28438441. The next prime is 28438451. The reversal of 28438447 is 74483482.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28438447 - 2¹⁵ = 28405679 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28438441) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 87072 + ... + 87397.

It is an arithmetic number, because the mean of its divisors is an integer number (7153270).

Almost surely, 2^28438447 is an apocalyptic number.

28438447 is a deficient number, since it is larger than the sum of its proper divisors (174633).

28438447 is a wasteful number, since it uses less digits than its factorization.

28438447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174632.

The product of its digits is 172032, while the sum is 40.

The square root of 28438447 is about 5332.7710432757. The cubic root of 28438447 is about 305.2356755893.

The spelling of 28438447 in words is "twenty-eight million, four hundred thirty-eight thousand, four hundred forty-seven".