78246775568 has 120 divisors (see below), whose sum is σ = 177103662408. Its totient is φ = 33347198976.

The previous prime is 78246775549. The next prime is 78246775571. The reversal of 78246775568 is 86557764287.

It can be written as a sum of positive squares in 12 ways, for example, as 44526064144 + 33720711424 = 211012^2 + 183632^2 .

It is a super-2 number, since 2×78246775568² (a number of 23 digits) contains 22 as substring.

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, 2420246 + ... + 2452362.

Almost surely, 2^78246775568 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 78246775568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (88551831204).

78246775568 is an abundant number, since it is smaller than the sum of its proper divisors (98856886840).

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

78246775568 is a wasteful number, since it uses less digits than its factorization.

78246775568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32221 (or 32202 counting only the distinct ones).

The product of its digits is 158054400, while the sum is 65.

The spelling of 78246775568 in words is "seventy-eight billion, two hundred forty-six million, seven hundred seventy-five thousand, five hundred sixty-eight".