78774313 has 2 divisors, whose sum is σ = 78774314. Its totient is φ = 78774312.

The previous prime is 78774307. The next prime is 78774329. The reversal of 78774313 is 31347787.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40297104 + 38477209 = 6348^2 + 6203^2 .

It is an emirp because it is prime and its reverse (31347787) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78774313 - 2⁵ = 78774281 is a prime.

It is not a weakly prime, because it can be changed into another prime (78774343) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39387156 + 39387157.

It is an arithmetic number, because the mean of its divisors is an integer number (39387157).

Almost surely, 2^78774313 is an apocalyptic number.

It is an amenable number.

78774313 is a deficient number, since it is larger than the sum of its proper divisors (1).

78774313 is an equidigital number, since it uses as much as digits as its factorization.

78774313 is an evil number, because the sum of its binary digits is even.

The product of its digits is 98784, while the sum is 40.

The square root of 78774313 is about 8875.4894512922. The cubic root of 78774313 is about 428.6750509171.

The spelling of 78774313 in words is "seventy-eight million, seven hundred seventy-four thousand, three hundred thirteen".