78427268 has 6 divisors (see below), whose sum is σ = 137247726. Its totient is φ = 39213632.

The previous prime is 78427267. The next prime is 78427277. The reversal of 78427268 is 86272487.

It can be written as a sum of positive squares in only one way, i.e., 53904964 + 24522304 = 7342^2 + 4952^2 .

It is not an unprimeable number, because it can be changed into a prime (78427267) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9803405 + ... + 9803412.

It is an arithmetic number, because the mean of its divisors is an integer number (22874621).

Almost surely, 2^78427268 is an apocalyptic number.

It is an amenable number.

78427268 is a deficient number, since it is larger than the sum of its proper divisors (58820458).

78427268 is a wasteful number, since it uses less digits than its factorization.

78427268 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19606821 (or 19606819 counting only the distinct ones).

The product of its digits is 301056, while the sum is 44.

The square root of 78427268 is about 8855.9171179500. The cubic root of 78427268 is about 428.0446062340.

The spelling of 78427268 in words is "seventy-eight million, four hundred twenty-seven thousand, two hundred sixty-eight".