77384786640 has 480 divisors, whose sum is σ = 295897918464. Its totient is φ = 16651837440.

The previous prime is 77384786621. The next prime is 77384786653. The reversal of 77384786640 is 4668748377.

It is a Harshad number since it is a multiple of its sum of digits (60).

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, 13485852 + ... + 13491588.

Almost surely, 2^77384786640 is an apocalyptic number.

77384786640 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 77384786640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (147948959232).

77384786640 is an abundant number, since it is smaller than the sum of its proper divisors (218513131824).

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

77384786640 is a wasteful number, since it uses less digits than its factorization.

77384786640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5835 (or 5822 counting only the distinct ones).

The product of its (nonzero) digits is 37933056, while the sum is 60.

The spelling of 77384786640 in words is "seventy-seven billion, three hundred eighty-four million, seven hundred eighty-six thousand, six hundred forty".