78369814 has 4 divisors (see below), whose sum is σ = 117554724. Its totient is φ = 39184906.

The previous prime is 78369793. The next prime is 78369853. The reversal of 78369814 is 41896387.

It is a happy number.

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

It is a super-2 number, since 2×78369814² = 12283655492789192, which contains 22 as substring.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19592452 + ... + 19592455.

It is an arithmetic number, because the mean of its divisors is an integer number (29388681).

Almost surely, 2^78369814 is an apocalyptic number.

78369814 is a deficient number, since it is larger than the sum of its proper divisors (39184910).

78369814 is a wasteful number, since it uses less digits than its factorization.

78369814 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39184909.

The product of its digits is 290304, while the sum is 46.

The square root of 78369814 is about 8852.6727037658. The cubic root of 78369814 is about 427.9400555113.

The spelling of 78369814 in words is "seventy-eight million, three hundred sixty-nine thousand, eight hundred fourteen".