78766487 has 4 divisors (see below), whose sum is σ = 78856176. Its totient is φ = 78676800.

The previous prime is 78766481. The next prime is 78766507. The reversal of 78766487 is 78466787.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78766487 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78766481) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43514 + ... + 45287.

It is an arithmetic number, because the mean of its divisors is an integer number (19714044).

Almost surely, 2^78766487 is an apocalyptic number.

78766487 is a deficient number, since it is larger than the sum of its proper divisors (89689).

78766487 is an equidigital number, since it uses as much as digits as its factorization.

78766487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89688.

The product of its digits is 3161088, while the sum is 53.

The square root of 78766487 is about 8875.0485632474. The cubic root of 78766487 is about 428.6608545718.

The spelling of 78766487 in words is "seventy-eight million, seven hundred sixty-six thousand, four hundred eighty-seven".