78084647 has 2 divisors, whose sum is σ = 78084648. Its totient is φ = 78084646.

The previous prime is 78084631. The next prime is 78084683. The reversal of 78084647 is 74648087.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78084647 - 2⁴ = 78084631 is a prime.

It is a super-2 number, since 2×78084647² = 12194424194229218, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78084598 and 78084607.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78084607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39042323 + 39042324.

It is an arithmetic number, because the mean of its divisors is an integer number (39042324).

Almost surely, 2^78084647 is an apocalyptic number.

78084647 is a deficient number, since it is larger than the sum of its proper divisors (1).

78084647 is an equidigital number, since it uses as much as digits as its factorization.

78084647 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 301056, while the sum is 44.

The square root of 78084647 is about 8836.5517595949. The cubic root of 78084647 is about 427.4203711565.

The spelling of 78084647 in words is "seventy-eight million, eighty-four thousand, six hundred forty-seven".