78464346644 has 24 divisors (see below), whose sum is σ = 137862081000. Its totient is φ = 39075491840.

The previous prime is 78464346643. The next prime is 78464346757. The reversal of 78464346644 is 44664346487.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 20377562500 + 58086784144 = 142750^2 + 241012^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 78464346644.

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 polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 983534 + ... + 1060314.

It is an arithmetic number, because the mean of its divisors is an integer number (5744253375).

Almost surely, 2^78464346644 is an apocalyptic number.

It is an amenable number.

78464346644 is a deficient number, since it is larger than the sum of its proper divisors (59397734356).

78464346644 is a wasteful number, since it uses less digits than its factorization.

78464346644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77803 (or 77801 counting only the distinct ones).

The product of its digits is 37158912, while the sum is 56.

The spelling of 78464346644 in words is "seventy-eight billion, four hundred sixty-four million, three hundred forty-six thousand, six hundred forty-four".