78458678 has 8 divisors (see below), whose sum is σ = 117750672. Its totient is φ = 39208456.

The previous prime is 78458671. The next prime is 78458683. The reversal of 78458678 is 87685487.

It is a happy number.

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

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78458671) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5225 + ... + 13572.

It is an arithmetic number, because the mean of its divisors is an integer number (14718834).

Almost surely, 2^78458678 is an apocalyptic number.

78458678 is a deficient number, since it is larger than the sum of its proper divisors (39291994).

78458678 is a wasteful number, since it uses less digits than its factorization.

78458678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20886.

The product of its digits is 3010560, while the sum is 53.

The square root of 78458678 is about 8857.6903310062. The cubic root of 78458678 is about 428.1017423422.

The spelling of 78458678 in words is "seventy-eight million, four hundred fifty-eight thousand, six hundred seventy-eight".