78463919 has 2 divisors, whose sum is σ = 78463920. Its totient is φ = 78463918.

The previous prime is 78463897. The next prime is 78463933. The reversal of 78463919 is 91936487.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78463919 is a prime.

It is a super-3 number, since 3×78463919³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78463969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39231959 + 39231960.

It is an arithmetic number, because the mean of its divisors is an integer number (39231960).

Almost surely, 2^78463919 is an apocalyptic number.

78463919 is a deficient number, since it is larger than the sum of its proper divisors (1).

78463919 is an equidigital number, since it uses as much as digits as its factorization.

78463919 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 326592, while the sum is 47.

The square root of 78463919 is about 8857.9861706824. The cubic root of 78463919 is about 428.1112744565. Note that the first 3 decimals are identical.

The spelling of 78463919 in words is "seventy-eight million, four hundred sixty-three thousand, nine hundred nineteen".