78855887458240 has 56 divisors (see below), whose sum is σ = 187952229652320. Its totient is φ = 31512681888768.

The previous prime is 78855887458171. The next prime is 78855887458267. The reversal of 78855887458240 is 4285478855887.

It is a super-2 number, since 2×78855887458240² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

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, 115569835 + ... + 116250154.

It is an arithmetic number, because the mean of its divisors is an integer number (3356289815220).

Almost surely, 2^{78855887458240} is an apocalyptic number.

It is an amenable number.

78855887458240 is an abundant number, since it is smaller than the sum of its proper divisors (109096342194080).

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

78855887458240 is a wasteful number, since it uses less digits than its factorization.

78855887458240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231821069 (or 231821059 counting only the distinct ones).

The product of its (nonzero) digits is 6422528000, while the sum is 79.

The spelling of 78855887458240 in words is "seventy-eight trillion, eight hundred fifty-five billion, eight hundred eighty-seven million, four hundred fifty-eight thousand, two hundred forty".