78640480444 has 48 divisors (see below), whose sum is σ = 141718179456. Its totient is φ = 38167588800.

The previous prime is 78640480379. The next prime is 78640480487. The reversal of 78640480444 is 44408404687.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 26467879 + ... + 26470849.

It is an arithmetic number, because the mean of its divisors is an integer number (2952462072).

Almost surely, 2^78640480444 is an apocalyptic number.

It is an amenable number.

78640480444 is a deficient number, since it is larger than the sum of its proper divisors (63077699012).

78640480444 is a wasteful number, since it uses less digits than its factorization.

78640480444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4426 (or 4424 counting only the distinct ones).

The product of its (nonzero) digits is 2752512, while the sum is 49.

The spelling of 78640480444 in words is "seventy-eight billion, six hundred forty million, four hundred eighty thousand, four hundred forty-four".