78464346645 has 32 divisors (see below), whose sum is σ = 132173193600. Its totient is φ = 39638329344.

The previous prime is 78464346643. The next prime is 78464346757. The reversal of 78464346645 is 54664346487.

It is a happy number.

It is not a de Polignac number, because 78464346645 - 2¹ = 78464346643 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78464346641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1915741 + ... + 1956269.

It is an arithmetic number, because the mean of its divisors is an integer number (4130412300).

Almost surely, 2^78464346645 is an apocalyptic number.

It is an amenable number.

78464346645 is a deficient number, since it is larger than the sum of its proper divisors (53708846955).

78464346645 is a wasteful number, since it uses less digits than its factorization.

78464346645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47349.

The product of its digits is 46448640, while the sum is 57.

The spelling of 78464346645 in words is "seventy-eight billion, four hundred sixty-four million, three hundred forty-six thousand, six hundred forty-five".