78464171 has 2 divisors, whose sum is σ = 78464172. Its totient is φ = 78464170.

The previous prime is 78464107. The next prime is 78464179. The reversal of 78464171 is 17146487.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78464171 - 2⁶ = 78464107 is a prime.

It is a super-2 number, since 2×78464171² = 12313252261434482, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78464179) 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, 39232085 + 39232086.

It is an arithmetic number, because the mean of its divisors is an integer number (39232086).

Almost surely, 2^78464171 is an apocalyptic number.

78464171 is a deficient number, since it is larger than the sum of its proper divisors (1).

78464171 is an equidigital number, since it uses as much as digits as its factorization.

78464171 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 37632, while the sum is 38.

The square root of 78464171 is about 8858.0003951230. Note that the first 3 decimals coincide. The cubic root of 78464171 is about 428.1117327730. Note that the first 3 decimals are identical.

The spelling of 78464171 in words is "seventy-eight million, four hundred sixty-four thousand, one hundred seventy-one".