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78643 is a prime number
BaseRepresentation
bin10011001100110011
310222212201
4103030303
510004033
61404031
7445165
oct231463
9128781
1078643
11540a4
1239617
1329a46
1420935
151847d
hex13333

78643 has 2 divisors, whose sum is σ = 78644. Its totient is φ = 78642.

The previous prime is 78623. The next prime is 78649. The reversal of 78643 is 34687.

It is a strong prime.

It is an emirp because it is prime and its reverse (34687) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78643 - 213 = 70451 is a prime.

It is a plaindrome in base 16.

It is not a weakly prime, because it can be changed into another prime (78649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39321 + 39322.

It is an arithmetic number, because the mean of its divisors is an integer number (39322).

278643 is an apocalyptic number.

78643 is a deficient number, since it is larger than the sum of its proper divisors (1).

78643 is an equidigital number, since it uses as much as digits as its factorization.

78643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4032, while the sum is 28.

The square root of 78643 is about 280.4335928522. The cubic root of 78643 is about 42.8436724862.

Subtracting from 78643 its reverse (34687), we obtain a triangular number (43956 = T296).

The spelling of 78643 in words is "seventy-eight thousand, six hundred forty-three".