78937643 has 2 divisors, whose sum is σ = 78937644. Its totient is φ = 78937642.

The previous prime is 78937631. The next prime is 78937657. The reversal of 78937643 is 34673987.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78937643 - 2⁴ = 78937627 is a prime.

It is not a weakly prime, because it can be changed into another prime (78937603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39468821 + 39468822.

It is an arithmetic number, because the mean of its divisors is an integer number (39468822).

Almost surely, 2^78937643 is an apocalyptic number.

78937643 is a deficient number, since it is larger than the sum of its proper divisors (1).

78937643 is an equidigital number, since it uses as much as digits as its factorization.

78937643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 762048, while the sum is 47.

The square root of 78937643 is about 8884.6858695173. The cubic root of 78937643 is about 428.9711168098.

The spelling of 78937643 in words is "seventy-eight million, nine hundred thirty-seven thousand, six hundred forty-three".