78486887 has 2 divisors, whose sum is σ = 78486888. Its totient is φ = 78486886.

The previous prime is 78486869. The next prime is 78486983. The reversal of 78486887 is 78868487.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78486887 - 2¹² = 78482791 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78486817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39243443 + 39243444.

It is an arithmetic number, because the mean of its divisors is an integer number (39243444).

Almost surely, 2^78486887 is an apocalyptic number.

78486887 is a deficient number, since it is larger than the sum of its proper divisors (1).

78486887 is an equidigital number, since it uses as much as digits as its factorization.

78486887 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4816896, while the sum is 56.

The square root of 78486887 is about 8859.2825330272. The cubic root of 78486887 is about 428.1530427011.

The spelling of 78486887 in words is "seventy-eight million, four hundred eighty-six thousand, eight hundred eighty-seven".