78319487 has 2 divisors, whose sum is σ = 78319488. Its totient is φ = 78319486.

The previous prime is 78319433. The next prime is 78319489. The reversal of 78319487 is 78491387.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78319487 - 2⁸ = 78319231 is a prime.

It is a super-2 number, since 2×78319487² = 12267884087886338, which contains 22 as substring.

Together with 78319489, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78319489) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39159743 + 39159744.

It is an arithmetic number, because the mean of its divisors is an integer number (39159744).

Almost surely, 2^78319487 is an apocalyptic number.

78319487 is a deficient number, since it is larger than the sum of its proper divisors (1).

78319487 is an equidigital number, since it uses as much as digits as its factorization.

78319487 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 338688, while the sum is 47.

The square root of 78319487 is about 8849.8297723742. The cubic root of 78319487 is about 427.8484320070.

The spelling of 78319487 in words is "seventy-eight million, three hundred nineteen thousand, four hundred eighty-seven".