78700087 has 2 divisors, whose sum is σ = 78700088. Its totient is φ = 78700086.

The previous prime is 78700079. The next prime is 78700091. The reversal of 78700087 is 78000787.

It is a strong prime.

It is an emirp because it is prime and its reverse (78000787) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78700087 - 2³ = 78700079 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78700387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39350043 + 39350044.

It is an arithmetic number, because the mean of its divisors is an integer number (39350044).

Almost surely, 2^78700087 is an apocalyptic number.

78700087 is a deficient number, since it is larger than the sum of its proper divisors (1).

78700087 is an equidigital number, since it uses as much as digits as its factorization.

78700087 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21952, while the sum is 37.

The square root of 78700087 is about 8871.3069499370. The cubic root of 78700087 is about 428.5403672779.

The spelling of 78700087 in words is "seventy-eight million, seven hundred thousand, eighty-seven".