78398087 has 2 divisors, whose sum is σ = 78398088. Its totient is φ = 78398086.

The previous prime is 78398071. The next prime is 78398137. The reversal of 78398087 is 78089387.

It is an a-pointer prime, because the next prime (78398137) can be obtained adding 78398087 to its sum of digits (50).

It is a weak prime.

It is an emirp because it is prime and its reverse (78089387) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78398087 - 2⁴ = 78398071 is a prime.

It is a super-2 number, since 2×78398087² = 12292520090519138, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78388087) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39199043 + 39199044.

It is an arithmetic number, because the mean of its divisors is an integer number (39199044).

Almost surely, 2^78398087 is an apocalyptic number.

78398087 is a deficient number, since it is larger than the sum of its proper divisors (1).

78398087 is an equidigital number, since it uses as much as digits as its factorization.

78398087 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 677376, while the sum is 50.

The square root of 78398087 is about 8854.2694221488. The cubic root of 78398087 is about 427.9915110990.

The spelling of 78398087 in words is "seventy-eight million, three hundred ninety-eight thousand, eighty-seven".