28620311 has 2 divisors, whose sum is σ = 28620312. Its totient is φ = 28620310.

The previous prime is 28620287. The next prime is 28620343. The reversal of 28620311 is 11302682.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28620311 - 2⁶ = 28620247 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28620391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14310155 + 14310156.

It is an arithmetic number, because the mean of its divisors is an integer number (14310156).

Almost surely, 2^28620311 is an apocalyptic number.

28620311 is a deficient number, since it is larger than the sum of its proper divisors (1).

28620311 is an equidigital number, since it uses as much as digits as its factorization.

28620311 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 28620311 is about 5349.7954166491. The cubic root of 28620311 is about 305.8849546877.

Adding to 28620311 its reverse (11302682), we get a palindrome (39922993).

The spelling of 28620311 in words is "twenty-eight million, six hundred twenty thousand, three hundred eleven".