71780063 has 2 divisors, whose sum is σ = 71780064. Its totient is φ = 71780062.

The previous prime is 71780057. The next prime is 71780087. The reversal of 71780063 is 36008717.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (36008717) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 71780063 - 2²⁰ = 70731487 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71780003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35890031 + 35890032.

It is an arithmetic number, because the mean of its divisors is an integer number (35890032).

Almost surely, 2^71780063 is an apocalyptic number.

71780063 is a deficient number, since it is larger than the sum of its proper divisors (1).

71780063 is an equidigital number, since it uses as much as digits as its factorization.

71780063 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7056, while the sum is 32.

The square root of 71780063 is about 8472.3115499845. The cubic root of 71780063 is about 415.5927331160.

The spelling of 71780063 in words is "seventy-one million, seven hundred eighty thousand, sixty-three".