78287 has 6 divisors (see below), whose sum is σ = 86184. Its totient is φ = 71060.

The previous prime is 78283. The next prime is 78301.

It is a happy number.

78287 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 78287 - 2² = 78283 is a prime.

It is a super-2 number, since 2×78287² = 12257708738, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78283) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 203 + ... + 444.

It is an arithmetic number, because the mean of its divisors is an integer number (14364).

2⁷⁸²⁸⁷ is an apocalyptic number.

78287 is a deficient number, since it is larger than the sum of its proper divisors (7897).

78287 is a wasteful number, since it uses less digits than its factorization.

78287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 669 (or 658 counting only the distinct ones).

The product of its digits is 6272, while the sum is 32.

The square root of 78287 is about 279.7981415235. The cubic root of 78287 is about 42.7789266509.

The spelling of 78287 in words is "seventy-eight thousand, two hundred eighty-seven".