78558978 has 8 divisors (see below), whose sum is σ = 157117968. Its totient is φ = 26186324.

The previous prime is 78558973. The next prime is 78559003. The reversal of 78558978 is 87985587.

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

78558978 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (78558973) 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, 6546576 + ... + 6546587.

It is an arithmetic number, because the mean of its divisors is an integer number (19639746).

Almost surely, 2^78558978 is an apocalyptic number.

78558978 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78558978 is a wasteful number, since it uses less digits than its factorization.

78558978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13093168.

The product of its digits is 5644800, while the sum is 57.

The square root of 78558978 is about 8863.3502695087. The cubic root of 78558978 is about 428.2840902207.

The spelling of 78558978 in words is "seventy-eight million, five hundred fifty-eight thousand, nine hundred seventy-eight".