78841286640 has 120 divisors (see below), whose sum is σ = 264826362528. Its totient is φ = 21020290560.

The previous prime is 78841286611. The next prime is 78841286663. The reversal of 78841286640 is 4668214887.

It is a tau number, because it is divible by the number of its divisors (120).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6604357 + ... + 6616283.

Almost surely, 2^78841286640 is an apocalyptic number.

It is an amenable number.

78841286640 is an abundant number, since it is smaller than the sum of its proper divisors (185985075888).

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

78841286640 is a wasteful number, since it uses less digits than its factorization.

78841286640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21127 (or 21118 counting only the distinct ones).

The product of its (nonzero) digits is 4128768, while the sum is 54.

The spelling of 78841286640 in words is "seventy-eight billion, eight hundred forty-one million, two hundred eighty-six thousand, six hundred forty".