78308227 has 2 divisors, whose sum is σ = 78308228. Its totient is φ = 78308226.

The previous prime is 78308221. The next prime is 78308231. The reversal of 78308227 is 72280387.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78308227 - 2⁷ = 78308099 is a prime.

It is a super-2 number, since 2×78308227² = 12264356831767058, which contains 22 as substring.

It is equal to p_4576483 and since 78308227 and 4576483 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (78308221) 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, 39154113 + 39154114.

It is an arithmetic number, because the mean of its divisors is an integer number (39154114).

Almost surely, 2^78308227 is an apocalyptic number.

78308227 is a deficient number, since it is larger than the sum of its proper divisors (1).

78308227 is an equidigital number, since it uses as much as digits as its factorization.

78308227 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 37632, while the sum is 37.

The square root of 78308227 is about 8849.1935790783. The cubic root of 78308227 is about 427.8279270879.

The spelling of 78308227 in words is "seventy-eight million, three hundred eight thousand, two hundred twenty-seven".