78837878786256 has 160 divisors (see below), whose sum is σ = 236154033745920. Its totient is φ = 25134452171136.

The previous prime is 78837878786209. The next prime is 78837878786257. The reversal of 78837878786256 is 65268787873887.

78837878786256 is a `hidden beast` number, since 7 + 88 + 378 + 7 + 87 + 86 + 2 + 5 + 6 = 666.

It is a super-2 number, since 2×78837878786256² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78837878786257) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 111796141 + ... + 112499123.

It is an arithmetic number, because the mean of its divisors is an integer number (1475962710912).

Almost surely, 2^{78837878786256} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78837878786256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (118077016872960).

78837878786256 is an abundant number, since it is smaller than the sum of its proper divisors (157316154959664).

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

78837878786256 is a wasteful number, since it uses less digits than its factorization.

78837878786256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 714310 (or 714298 counting only the distinct ones).

The product of its digits is 84970045440, while the sum is 90.

The spelling of 78837878786256 in words is "seventy-eight trillion, eight hundred thirty-seven billion, eight hundred seventy-eight million, seven hundred eighty-six thousand, two hundred fifty-six".