28562381 has 2 divisors, whose sum is σ = 28562382. Its totient is φ = 28562380.

The previous prime is 28562357. The next prime is 28562411. The reversal of 28562381 is 18326582.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28526281 + 36100 = 5341^2 + 190^2 .

It is a cyclic number.

It is not a de Polignac number, because 28562381 - 2¹⁴ = 28545997 is a prime.

It is a super-2 number, since 2×28562381² = 1631619216778322, 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 (28562311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14281190 + 14281191.

It is an arithmetic number, because the mean of its divisors is an integer number (14281191).

Almost surely, 2^28562381 is an apocalyptic number.

It is an amenable number.

28562381 is a deficient number, since it is larger than the sum of its proper divisors (1).

28562381 is an equidigital number, since it uses as much as digits as its factorization.

28562381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23040, while the sum is 35.

The square root of 28562381 is about 5344.3784484260. The cubic root of 28562381 is about 305.6784360322.

The spelling of 28562381 in words is "twenty-eight million, five hundred sixty-two thousand, three hundred eighty-one".