28522381 has 2 divisors, whose sum is σ = 28522382. Its totient is φ = 28522380.

The previous prime is 28522367. The next prime is 28522409. The reversal of 28522381 is 18322582.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24661156 + 3861225 = 4966^2 + 1965^2 .

It is a cyclic number.

It is not a de Polignac number, because 28522381 - 2⁵ = 28522349 is a prime.

It is a super-2 number, since 2×28522381² = 1627052435818322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28522181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14261190 + 14261191.

It is an arithmetic number, because the mean of its divisors is an integer number (14261191).

Almost surely, 2^28522381 is an apocalyptic number.

It is an amenable number.

28522381 is a deficient number, since it is larger than the sum of its proper divisors (1).

28522381 is an equidigital number, since it uses as much as digits as its factorization.

28522381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7680, while the sum is 31.

The square root of 28522381 is about 5340.6348873519. The cubic root of 28522381 is about 305.5356742448.

The spelling of 28522381 in words is "twenty-eight million, five hundred twenty-two thousand, three hundred eighty-one".