78641078 has 8 divisors (see below), whose sum is σ = 119895600. Its totient is φ = 38675880.

The previous prime is 78641077. The next prime is 78641081. The reversal of 78641078 is 87014687.

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 (78641077) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 322178 + ... + 322421.

It is an arithmetic number, because the mean of its divisors is an integer number (14986950).

Almost surely, 2^78641078 is an apocalyptic number.

78641078 is a deficient number, since it is larger than the sum of its proper divisors (41254522).

78641078 is a wasteful number, since it uses less digits than its factorization.

78641078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 644662.

The product of its (nonzero) digits is 75264, while the sum is 41.

The square root of 78641078 is about 8867.9804916339. The cubic root of 78641078 is about 428.4332345655.

The spelling of 78641078 in words is "seventy-eight million, six hundred forty-one thousand, seventy-eight".