78432169840 has 20 divisors (see below), whose sum is σ = 182354795064. Its totient is φ = 31372867904.

The previous prime is 78432169817. The next prime is 78432169861. The reversal of 78432169840 is 4896123487.

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 490200982 + ... + 490201141.

Almost surely, 2^78432169840 is an apocalyptic number.

It is an amenable number.

78432169840 is an abundant number, since it is smaller than the sum of its proper divisors (103922625224).

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

78432169840 is a wasteful number, since it uses less digits than its factorization.

78432169840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 980402136 (or 980402130 counting only the distinct ones).

The product of its (nonzero) digits is 2322432, while the sum is 52.

The spelling of 78432169840 in words is "seventy-eight billion, four hundred thirty-two million, one hundred sixty-nine thousand, eight hundred forty".