78084577 has 2 divisors, whose sum is σ = 78084578. Its totient is φ = 78084576.

The previous prime is 78084569. The next prime is 78084581. The reversal of 78084577 is 77548087.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50637456 + 27447121 = 7116^2 + 5239^2 .

It is an emirp because it is prime and its reverse (77548087) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78084577 - 2³ = 78084569 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (78084527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39042288 + 39042289.

It is an arithmetic number, because the mean of its divisors is an integer number (39042289).

Almost surely, 2^78084577 is an apocalyptic number.

It is an amenable number.

78084577 is a deficient number, since it is larger than the sum of its proper divisors (1).

78084577 is an equidigital number, since it uses as much as digits as its factorization.

78084577 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 439040, while the sum is 46.

The square root of 78084577 is about 8836.5477987730. The cubic root of 78084577 is about 427.4202434342.

The spelling of 78084577 in words is "seventy-eight million, eighty-four thousand, five hundred seventy-seven".