78478670645 has 8 divisors (see below), whose sum is σ = 98268944256. Its totient is φ = 60053243536.

The previous prime is 78478670531. The next prime is 78478670663. The reversal of 78478670645 is 54607687487.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 78478670645 - 2¹⁸ = 78478408501 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 341211497 + ... + 341211726.

It is an arithmetic number, because the mean of its divisors is an integer number (12283618032).

Almost surely, 2^78478670645 is an apocalyptic number.

It is an amenable number.

78478670645 is a deficient number, since it is larger than the sum of its proper divisors (19790273611).

78478670645 is a wasteful number, since it uses less digits than its factorization.

78478670645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 682423251.

The product of its (nonzero) digits is 63221760, while the sum is 62.

The spelling of 78478670645 in words is "seventy-eight billion, four hundred seventy-eight million, six hundred seventy thousand, six hundred forty-five".