28221847 has 2 divisors, whose sum is σ = 28221848. Its totient is φ = 28221846.

The previous prime is 28221839. The next prime is 28221871. The reversal of 28221847 is 74812282.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28221847 - 2³ = 28221839 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28221827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14110923 + 14110924.

It is an arithmetic number, because the mean of its divisors is an integer number (14110924).

Almost surely, 2^28221847 is an apocalyptic number.

28221847 is a deficient number, since it is larger than the sum of its proper divisors (1).

28221847 is an equidigital number, since it uses as much as digits as its factorization.

28221847 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14336, while the sum is 34.

The square root of 28221847 is about 5312.4238347481. The cubic root of 28221847 is about 304.4587624121.

The spelling of 28221847 in words is "twenty-eight million, two hundred twenty-one thousand, eight hundred forty-seven".