78718279440 has 40 divisors (see below), whose sum is σ = 244026667008. Its totient is φ = 20991541120.

The previous prime is 78718279411. The next prime is 78718279477. The reversal of 78718279440 is 4497281787.

It is a tau number, because it is divible by the number of its divisors (40).

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, 163996176 + ... + 163996655.

Almost surely, 2^78718279440 is an apocalyptic number.

It is an amenable number.

78718279440 is an abundant number, since it is smaller than the sum of its proper divisors (165308387568).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78718279440 is a wasteful number, since it uses less digits than its factorization.

78718279440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 327992847 (or 327992841 counting only the distinct ones).

The product of its (nonzero) digits is 6322176, while the sum is 57.

The spelling of 78718279440 in words is "seventy-eight billion, seven hundred eighteen million, two hundred seventy-nine thousand, four hundred forty".