78471493 has 2 divisors, whose sum is σ = 78471494. Its totient is φ = 78471492.

The previous prime is 78471479. The next prime is 78471511. The reversal of 78471493 is 39417487.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 67601284 + 10870209 = 8222^2 + 3297^2 .

It is a cyclic number.

It is not a de Polignac number, because 78471493 - 2⁹ = 78470981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78471433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39235746 + 39235747.

It is an arithmetic number, because the mean of its divisors is an integer number (39235747).

Almost surely, 2^78471493 is an apocalyptic number.

It is an amenable number.

78471493 is a deficient number, since it is larger than the sum of its proper divisors (1).

78471493 is an equidigital number, since it uses as much as digits as its factorization.

78471493 is an evil number, because the sum of its binary digits is even.

The product of its digits is 169344, while the sum is 43.

The square root of 78471493 is about 8858.4136841762. The cubic root of 78471493 is about 428.1250489850.

The spelling of 78471493 in words is "seventy-eight million, four hundred seventy-one thousand, four hundred ninety-three".