28832381 has 2 divisors, whose sum is σ = 28832382. Its totient is φ = 28832380.

The previous prime is 28832347. The next prime is 28832413. The reversal of 28832381 is 18323882.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26429881 + 2402500 = 5141^2 + 1550^2 .

It is a cyclic number.

It is not a de Polignac number, because 28832381 - 2¹⁸ = 28570237 is a prime.

It is a super-2 number, since 2×28832381² = 1662612388258322, 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 (28832341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14416190 + 14416191.

It is an arithmetic number, because the mean of its divisors is an integer number (14416191).

Almost surely, 2^28832381 is an apocalyptic number.

It is an amenable number.

28832381 is a deficient number, since it is larger than the sum of its proper divisors (1).

28832381 is an equidigital number, since it uses as much as digits as its factorization.

28832381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18432, while the sum is 35.

The square root of 28832381 is about 5369.5792200134. The cubic root of 28832381 is about 306.6386089379.

The spelling of 28832381 in words is "twenty-eight million, eight hundred thirty-two thousand, three hundred eighty-one".