78417643 has 2 divisors, whose sum is σ = 78417644. Its totient is φ = 78417642.

The previous prime is 78417629. The next prime is 78417659. The reversal of 78417643 is 34671487.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78417643 - 2⁵ = 78417611 is a prime.

It is a super-2 number, since 2×78417643² = 12298653467350898, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78417596 and 78417605.

It is not a weakly prime, because it can be changed into another prime (78417743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39208821 + 39208822.

It is an arithmetic number, because the mean of its divisors is an integer number (39208822).

Almost surely, 2^78417643 is an apocalyptic number.

78417643 is a deficient number, since it is larger than the sum of its proper divisors (1).

78417643 is an equidigital number, since it uses as much as digits as its factorization.

78417643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 112896, while the sum is 40.

The square root of 78417643 is about 8855.3736792978. The cubic root of 78417643 is about 428.0270949016.

The spelling of 78417643 in words is "seventy-eight million, four hundred seventeen thousand, six hundred forty-three".