78614978 has 8 divisors (see below), whose sum is σ = 126993468. Its totient is φ = 36283824.

The previous prime is 78614971. The next prime is 78614993. The reversal of 78614978 is 87941687.

It can be written as a sum of positive squares in 2 ways, for example, as 55160329 + 23454649 = 7427^2 + 4843^2 .

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

It is not an unprimeable number, because it can be changed into a prime (78614971) 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 in 3 ways as a sum of consecutive naturals, for example, 1511801 + ... + 1511852.

Almost surely, 2^78614978 is an apocalyptic number.

78614978 is a deficient number, since it is larger than the sum of its proper divisors (48378490).

78614978 is a wasteful number, since it uses less digits than its factorization.

78614978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3023668.

The product of its digits is 677376, while the sum is 50.

The square root of 78614978 is about 8866.5087830555. The cubic root of 78614978 is about 428.3858320925.

The spelling of 78614978 in words is "seventy-eight million, six hundred fourteen thousand, nine hundred seventy-eight".