78688403 has 2 divisors, whose sum is σ = 78688404. Its totient is φ = 78688402.

The previous prime is 78688369. The next prime is 78688417. The reversal of 78688403 is 30488687.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78688403 - 2²⁰ = 77639827 is a prime.

It is not a weakly prime, because it can be changed into another prime (78688703) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39344201 + 39344202.

It is an arithmetic number, because the mean of its divisors is an integer number (39344202).

Almost surely, 2^78688403 is an apocalyptic number.

78688403 is a deficient number, since it is larger than the sum of its proper divisors (1).

78688403 is an equidigital number, since it uses as much as digits as its factorization.

78688403 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 258048, while the sum is 44.

The square root of 78688403 is about 8870.6483979470. The cubic root of 78688403 is about 428.5191588581.

The spelling of 78688403 in words is "seventy-eight million, six hundred eighty-eight thousand, four hundred three".