78285227 has 2 divisors, whose sum is σ = 78285228. Its totient is φ = 78285226.

The previous prime is 78285223. The next prime is 78285257. The reversal of 78285227 is 72258287.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78285227 - 2² = 78285223 is a prime.

It is a super-2 number, since 2×78285227² = 12257153532883058, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78285223) 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, 39142613 + 39142614.

It is an arithmetic number, because the mean of its divisors is an integer number (39142614).

Almost surely, 2^78285227 is an apocalyptic number.

78285227 is a deficient number, since it is larger than the sum of its proper divisors (1).

78285227 is an equidigital number, since it uses as much as digits as its factorization.

78285227 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 125440, while the sum is 41.

The square root of 78285227 is about 8847.8939301960. The cubic root of 78285227 is about 427.7860370412.

The spelling of 78285227 in words is "seventy-eight million, two hundred eighty-five thousand, two hundred twenty-seven".