78388087 has 2 divisors, whose sum is σ = 78388088. Its totient is φ = 78388086.

The previous prime is 78388067. The next prime is 78388099. The reversal of 78388087 is 78088387.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78388087 is a prime.

It is a super-2 number, since 2×78388087² = 12289384367039138, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78388087.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78388027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39194043 + 39194044.

It is an arithmetic number, because the mean of its divisors is an integer number (39194044).

Almost surely, 2^78388087 is an apocalyptic number.

78388087 is a deficient number, since it is larger than the sum of its proper divisors (1).

78388087 is an equidigital number, since it uses as much as digits as its factorization.

78388087 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 602112, while the sum is 49.

The square root of 78388087 is about 8853.7047048114. The cubic root of 78388087 is about 427.9733129632.

The spelling of 78388087 in words is "seventy-eight million, three hundred eighty-eight thousand, eighty-seven".