78820905040 has 40 divisors (see below), whose sum is σ = 189170178048. Its totient is φ = 30511317120.

The previous prime is 78820905019. The next prime is 78820905041. The reversal of 78820905040 is 4050902887.

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

It is a hoax number, since the sum of its digits (43) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78820905041) 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, 15888832 + ... + 15893791.

Almost surely, 2^78820905040 is an apocalyptic number.

It is an amenable number.

78820905040 is an abundant number, since it is smaller than the sum of its proper divisors (110349273008).

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

78820905040 is a wasteful number, since it uses less digits than its factorization.

78820905040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31782667 (or 31782661 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 43.

The spelling of 78820905040 in words is "seventy-eight billion, eight hundred twenty million, nine hundred five thousand, forty".