78255487 has 2 divisors, whose sum is σ = 78255488. Its totient is φ = 78255486.

The previous prime is 78255479. The next prime is 78255491. The reversal of 78255487 is 78455287.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78255487 - 2³ = 78255479 is a prime.

It is a super-2 number, since 2×78255487² = 12247842491214338, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78255467) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39127743 + 39127744.

It is an arithmetic number, because the mean of its divisors is an integer number (39127744).

Almost surely, 2^78255487 is an apocalyptic number.

78255487 is a deficient number, since it is larger than the sum of its proper divisors (1).

78255487 is an equidigital number, since it uses as much as digits as its factorization.

78255487 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 627200, while the sum is 46.

The square root of 78255487 is about 8846.2131446173. The cubic root of 78255487 is about 427.7318592242.

The spelling of 78255487 in words is "seventy-eight million, two hundred fifty-five thousand, four hundred eighty-seven".