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28508413 is a prime number
BaseRepresentation
bin110110011000…
…0000011111101
31222122101012011
41230300003331
524244232123
62455011221
7464213623
oct154600375
958571164
1028508413
111510187a
129669b11
135ba20ab
143b01513
152781e0d
hex1b300fd

28508413 has 2 divisors, whose sum is σ = 28508414. Its totient is φ = 28508412.

The previous prime is 28508399. The next prime is 28508419. The reversal of 28508413 is 31480582.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25130169 + 3378244 = 5013^2 + 1838^2 .

It is a cyclic number.

It is not a de Polignac number, because 28508413 - 29 = 28507901 is a prime.

It is a super-2 number, since 2×285084132 = 1625459223557138, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28508419) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14254206 + 14254207.

It is an arithmetic number, because the mean of its divisors is an integer number (14254207).

Almost surely, 228508413 is an apocalyptic number.

It is an amenable number.

28508413 is a deficient number, since it is larger than the sum of its proper divisors (1).

28508413 is an equidigital number, since it uses as much as digits as its factorization.

28508413 is an odious number, because the sum of its binary digits is odd.

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

The square root of 28508413 is about 5339.3270175182. The cubic root of 28508413 is about 305.4857903875.

Adding to 28508413 its reverse (31480582), we get a palindrome (59988995).

The spelling of 28508413 in words is "twenty-eight million, five hundred eight thousand, four hundred thirteen".