28424381 has 2 divisors, whose sum is σ = 28424382. Its totient is φ = 28424380.

The previous prime is 28424351. The next prime is 28424387. The reversal of 28424381 is 18342482.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22944100 + 5480281 = 4790^2 + 2341^2 .

It is a cyclic number.

It is not a de Polignac number, because 28424381 - 2²² = 24230077 is a prime.

It is a super-2 number, since 2×28424381² = 1615890870466322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28424387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14212190 + 14212191.

It is an arithmetic number, because the mean of its divisors is an integer number (14212191).

Almost surely, 2^28424381 is an apocalyptic number.

It is an amenable number.

28424381 is a deficient number, since it is larger than the sum of its proper divisors (1).

28424381 is an equidigital number, since it uses as much as digits as its factorization.

28424381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12288, while the sum is 32.

The square root of 28424381 is about 5331.4520536154. The cubic root of 28424381 is about 305.1853428705.

The spelling of 28424381 in words is "twenty-eight million, four hundred twenty-four thousand, three hundred eighty-one".