78218467 has 2 divisors, whose sum is σ = 78218468. Its totient is φ = 78218466.

The previous prime is 78218417. The next prime is 78218471. The reversal of 78218467 is 76481287.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78218467 - 2¹¹ = 78216419 is a prime.

It is a super-2 number, since 2×78218467² = 12236257159660178, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78218417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39109233 + 39109234.

It is an arithmetic number, because the mean of its divisors is an integer number (39109234).

Almost surely, 2^78218467 is an apocalyptic number.

78218467 is a deficient number, since it is larger than the sum of its proper divisors (1).

78218467 is an equidigital number, since it uses as much as digits as its factorization.

78218467 is an evil number, because the sum of its binary digits is even.

The product of its digits is 150528, while the sum is 43.

The square root of 78218467 is about 8844.1204763391. The cubic root of 78218467 is about 427.6644001375.

The spelling of 78218467 in words is "seventy-eight million, two hundred eighteen thousand, four hundred sixty-seven".