78777245 has 8 divisors (see below), whose sum is σ = 94802616. Its totient is φ = 62841856.

The previous prime is 78777241. The next prime is 78777263. The reversal of 78777245 is 54277787.

It can be written as a sum of positive squares in 4 ways, for example, as 17530969 + 61246276 = 4187^2 + 7826^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 78777245 - 2² = 78777241 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 78777245.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78777241) 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 7 ways as a sum of consecutive naturals, for example, 20552 + ... + 24081.

It is an arithmetic number, because the mean of its divisors is an integer number (11850327).

Almost surely, 2^78777245 is an apocalyptic number.

It is an amenable number.

78777245 is a deficient number, since it is larger than the sum of its proper divisors (16025371).

78777245 is a wasteful number, since it uses less digits than its factorization.

78777245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44991.

The product of its digits is 768320, while the sum is 47.

The square root of 78777245 is about 8875.6546237447. The cubic root of 78777245 is about 428.6803693160.

The spelling of 78777245 in words is "seventy-eight million, seven hundred seventy-seven thousand, two hundred forty-five".