78612019 has 2 divisors, whose sum is σ = 78612020. Its totient is φ = 78612018.

The previous prime is 78612007. The next prime is 78612049. The reversal of 78612019 is 91021687.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78612019 - 2⁷ = 78611891 is a prime.

It is a super-2 number, since 2×78612019² = 12359699062512722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78612049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39306009 + 39306010.

It is an arithmetic number, because the mean of its divisors is an integer number (39306010).

Almost surely, 2^78612019 is an apocalyptic number.

78612019 is a deficient number, since it is larger than the sum of its proper divisors (1).

78612019 is an equidigital number, since it uses as much as digits as its factorization.

78612019 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6048, while the sum is 34.

The square root of 78612019 is about 8866.3419176118. The cubic root of 78612019 is about 428.3804573339.

The spelling of 78612019 in words is "seventy-eight million, six hundred twelve thousand, nineteen".