77663139840 has 1152 divisors, whose sum is σ = 324541002240. Its totient is φ = 16927948800.

The previous prime is 77663139821. The next prime is 77663139889. The reversal of 77663139840 is 4893136677.

It is a tau number, because it is divible by the number of its divisors (1152).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 935700439 + ... + 935700521.

It is an arithmetic number, because the mean of its divisors is an integer number (281719620).

Almost surely, 2^77663139840 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 77663139840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (162270501120).

77663139840 is an abundant number, since it is smaller than the sum of its proper divisors (246877862400).

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

77663139840 is a wasteful number, since it uses less digits than its factorization.

77663139840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211 (or 188 counting only the distinct ones).

The product of its (nonzero) digits is 4572288, while the sum is 54.

The spelling of 77663139840 in words is "seventy-seven billion, six hundred sixty-three million, one hundred thirty-nine thousand, eight hundred forty".