78784135378 has 8 divisors (see below), whose sum is σ = 127266680268. Its totient is φ = 36361908624.

The previous prime is 78784135373. The next prime is 78784135387. The reversal of 78784135378 is 87353148787.

It can be written as a sum of positive squares in 2 ways, for example, as 76144539249 + 2639596129 = 275943^2 + 51377^2 .

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

It is not an unprimeable number, because it can be changed into a prime (78784135373) 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 in 3 ways as a sum of consecutive naturals, for example, 1515079501 + ... + 1515079552.

Almost surely, 2^78784135378 is an apocalyptic number.

78784135378 is a deficient number, since it is larger than the sum of its proper divisors (48482544890).

78784135378 is a wasteful number, since it uses less digits than its factorization.

78784135378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3030159068.

The product of its digits is 31610880, while the sum is 61.

The spelling of 78784135378 in words is "seventy-eight billion, seven hundred eighty-four million, one hundred thirty-five thousand, three hundred seventy-eight".