78255287 has 4 divisors (see below), whose sum is σ = 85369416. Its totient is φ = 71141160.

The previous prime is 78255271. The next prime is 78255293.

78255287 is nontrivially palindromic in base 10.

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

It is a cyclic number.

It is not a de Polignac number, because 78255287 - 2⁴ = 78255271 is a prime.

It is a super-2 number, since 2×78255287² = 12247779886904738, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78255217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3557048 + ... + 3557069.

It is an arithmetic number, because the mean of its divisors is an integer number (21342354).

Almost surely, 2^78255287 is an apocalyptic number.

78255287 is a deficient number, since it is larger than the sum of its proper divisors (7114129).

78255287 is a wasteful number, since it uses less digits than its factorization.

78255287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7114128.

The product of its digits is 313600, while the sum is 44.

The square root of 78255287 is about 8846.2018403380. The cubic root of 78255287 is about 427.7314948346.

The spelling of 78255287 in words is "seventy-eight million, two hundred fifty-five thousand, two hundred eighty-seven".