78281207 has 2 divisors, whose sum is σ = 78281208. Its totient is φ = 78281206.

The previous prime is 78281191. The next prime is 78281219. The reversal of 78281207 is 70218287.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78281207 - 2⁴ = 78281191 is a prime.

It is a super-2 number, since 2×78281207² = 12255894738753698, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78281257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39140603 + 39140604.

It is an arithmetic number, because the mean of its divisors is an integer number (39140604).

Almost surely, 2^78281207 is an apocalyptic number.

78281207 is a deficient number, since it is larger than the sum of its proper divisors (1).

78281207 is an equidigital number, since it uses as much as digits as its factorization.

78281207 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12544, while the sum is 35.

The square root of 78281207 is about 8847.6667545743. Note that the first 3 decimals coincide. The cubic root of 78281207 is about 427.7787145473.

The spelling of 78281207 in words is "seventy-eight million, two hundred eighty-one thousand, two hundred seven".