78964811378 has 4 divisors (see below), whose sum is σ = 118447217070. Its totient is φ = 39482405688.

The previous prime is 78964811363. The next prime is 78964811383. The reversal of 78964811378 is 87311846987.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 87311846987 = 79 ⋅1105213253.

It can be written as a sum of positive squares in only one way, i.e., 58140301129 + 20824510249 = 241123^2 + 144307^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 78964811378.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19741202843 + ... + 19741202846.

Almost surely, 2^78964811378 is an apocalyptic number.

78964811378 is a deficient number, since it is larger than the sum of its proper divisors (39482405692).

78964811378 is a wasteful number, since it uses less digits than its factorization.

78964811378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39482405691.

The product of its digits is 16257024, while the sum is 62.

The spelling of 78964811378 in words is "seventy-eight billion, nine hundred sixty-four million, eight hundred eleven thousand, three hundred seventy-eight".