77869252608 has 128 divisors (see below), whose sum is σ = 237314293440. Its totient is φ = 22248161280.

The previous prime is 77869252603. The next prime is 77869252609. The reversal of 77869252608 is 80625296877.

It is a tau number, because it is divible by the number of its divisors (128).

It is not an unprimeable number, because it can be changed into a prime (77869252603) 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, 631548 + ... + 744708.

Almost surely, 2^77869252608 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 77869252608, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (118657146720).

77869252608 is an abundant number, since it is smaller than the sum of its proper divisors (159445040832).

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

77869252608 is an equidigital number, since it uses as much as digits as its factorization.

77869252608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113201 (or 113173 counting only the distinct ones).

The product of its (nonzero) digits is 20321280, while the sum is 60.

The spelling of 77869252608 in words is "seventy-seven billion, eight hundred sixty-nine million, two hundred fifty-two thousand, six hundred eight".