78712019 has 2 divisors, whose sum is σ = 78712020. Its totient is φ = 78712018.

The previous prime is 78712009. The next prime is 78712033. The reversal of 78712019 is 91021787.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78712019 - 2¹⁶ = 78646483 is a prime.

It is a super-2 number, since 2×78712019² = 12391163870112722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 78712019.

It is not a weakly prime, because it can be changed into another prime (78712009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39356009 + 39356010.

It is an arithmetic number, because the mean of its divisors is an integer number (39356010).

Almost surely, 2^78712019 is an apocalyptic number.

78712019 is a deficient number, since it is larger than the sum of its proper divisors (1).

78712019 is an equidigital number, since it uses as much as digits as its factorization.

78712019 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7056, while the sum is 35.

The square root of 78712019 is about 8871.9794296425. The cubic root of 78712019 is about 428.5620236931.

The spelling of 78712019 in words is "seventy-eight million, seven hundred twelve thousand, nineteen".