78678518 has 4 divisors (see below), whose sum is σ = 118017780. Its totient is φ = 39339258.

The previous prime is 78678511. The next prime is 78678529. The reversal of 78678518 is 81587687.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78678511) by changing a digit.

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, 19669628 + ... + 19669631.

It is an arithmetic number, because the mean of its divisors is an integer number (29504445).

Almost surely, 2^78678518 is an apocalyptic number.

78678518 is a deficient number, since it is larger than the sum of its proper divisors (39339262).

78678518 is a wasteful number, since it uses less digits than its factorization.

78678518 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39339261.

The product of its digits is 752640, while the sum is 50.

The square root of 78678518 is about 8870.0912058445. The cubic root of 78678518 is about 428.5012142855.

The spelling of 78678518 in words is "seventy-eight million, six hundred seventy-eight thousand, five hundred eighteen".