78255503 has 2 divisors, whose sum is σ = 78255504. Its totient is φ = 78255502.

The previous prime is 78255491. The next prime is 78255533. The reversal of 78255503 is 30555287.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78255503 - 2⁴ = 78255487 is a prime.

It is a super-2 number, since 2×78255503² = 12247847499566018, which contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78255533) 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 as a sum of consecutive naturals, namely, 39127751 + 39127752.

It is an arithmetic number, because the mean of its divisors is an integer number (39127752).

Almost surely, 2^78255503 is an apocalyptic number.

78255503 is a deficient number, since it is larger than the sum of its proper divisors (1).

78255503 is an equidigital number, since it uses as much as digits as its factorization.

78255503 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 42000, while the sum is 35.

The square root of 78255503 is about 8846.2140489590. The cubic root of 78255503 is about 427.7318883753.

The spelling of 78255503 in words is "seventy-eight million, two hundred fifty-five thousand, five hundred three".