28300381 has 2 divisors, whose sum is σ = 28300382. Its totient is φ = 28300380.

The previous prime is 28300379. The next prime is 28300399. The reversal of 28300381 is 18300382.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27562500 + 737881 = 5250^2 + 859^2 .

It is a cyclic number.

It is not a de Polignac number, because 28300381 - 2¹ = 28300379 is a prime.

It is a super-2 number, since 2×28300381² = 1601823129490322, which contains 22 as substring.

Together with 28300379, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28300351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14150190 + 14150191.

It is an arithmetic number, because the mean of its divisors is an integer number (14150191).

Almost surely, 2^28300381 is an apocalyptic number.

It is an amenable number.

28300381 is a deficient number, since it is larger than the sum of its proper divisors (1).

28300381 is an equidigital number, since it uses as much as digits as its factorization.

28300381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 28300381 is about 5319.8102409766. The cubic root of 28300381 is about 304.7409104930.

Subtracting from 28300381 its reverse (18300382), we obtain a palindrome (9999999).

The spelling of 28300381 in words is "twenty-eight million, three hundred thousand, three hundred eighty-one".