78717087 has 12 divisors (see below), whose sum is σ = 114094344. Its totient is φ = 52297200.

The previous prime is 78717083. The next prime is 78717127. The reversal of 78717087 is 78071787.

It is not a de Polignac number, because 78717087 - 2² = 78717083 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78717083) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12289 + ... + 17562.

It is an arithmetic number, because the mean of its divisors is an integer number (9507862).

Almost surely, 2^78717087 is an apocalyptic number.

78717087 is a deficient number, since it is larger than the sum of its proper divisors (35377257).

78717087 is a wasteful number, since it uses less digits than its factorization.

78717087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30150 (or 30147 counting only the distinct ones).

The product of its (nonzero) digits is 153664, while the sum is 45.

The square root of 78717087 is about 8872.2650433810. The cubic root of 78717087 is about 428.5712213809.

The spelling of 78717087 in words is "seventy-eight million, seven hundred seventeen thousand, eighty-seven".