78363814 has 4 divisors (see below), whose sum is σ = 117545724. Its totient is φ = 39181906.

The previous prime is 78363811. The next prime is 78363827. The reversal of 78363814 is 41836387.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×78363814² = 12281774689253192, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78363811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19590952 + ... + 19590955.

It is an arithmetic number, because the mean of its divisors is an integer number (29386431).

Almost surely, 2^78363814 is an apocalyptic number.

78363814 is a deficient number, since it is larger than the sum of its proper divisors (39181910).

78363814 is a wasteful number, since it uses less digits than its factorization.

78363814 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39181909.

The product of its digits is 96768, while the sum is 40.

The square root of 78363814 is about 8852.3338165706. Note that the first 3 decimals coincide. The cubic root of 78363814 is about 427.9291341896.

The spelling of 78363814 in words is "seventy-eight million, three hundred sixty-three thousand, eight hundred fourteen".