78668620 has 12 divisors (see below), whose sum is σ = 165204144. Its totient is φ = 31467440.

The previous prime is 78668609. The next prime is 78668621. The reversal of 78668620 is 2686687.

It is not an unprimeable number, because it can be changed into a prime (78668621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1966696 + ... + 1966735.

It is an arithmetic number, because the mean of its divisors is an integer number (13767012).

Almost surely, 2^78668620 is an apocalyptic number.

It is an amenable number.

78668620 is an abundant number, since it is smaller than the sum of its proper divisors (86535524).

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

78668620 is a wasteful number, since it uses less digits than its factorization.

78668620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3933440 (or 3933438 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 43.

The square root of 78668620 is about 8869.5332458929. The cubic root of 78668620 is about 428.4832446076.

The spelling of 78668620 in words is "seventy-eight million, six hundred sixty-eight thousand, six hundred twenty".