78568877 has 2 divisors, whose sum is σ = 78568878. Its totient is φ = 78568876.

The previous prime is 78568837. The next prime is 78568891. The reversal of 78568877 is 77886587.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 78393316 + 175561 = 8854^2 + 419^2 .

It is an emirp because it is prime and its reverse (77886587) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78568877 - 2¹² = 78564781 is a prime.

It is a super-2 number, since 2×78568877² = 12346136866082258, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78568817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39284438 + 39284439.

It is an arithmetic number, because the mean of its divisors is an integer number (39284439).

Almost surely, 2^78568877 is an apocalyptic number.

It is an amenable number.

78568877 is a deficient number, since it is larger than the sum of its proper divisors (1).

78568877 is an equidigital number, since it uses as much as digits as its factorization.

78568877 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5268480, while the sum is 56.

The square root of 78568877 is about 8863.9086750711. The cubic root of 78568877 is about 428.3020784305.

The spelling of 78568877 in words is "seventy-eight million, five hundred sixty-eight thousand, eight hundred seventy-seven".