388163780640 has 240 divisors, whose sum is σ = 1370768591808. Its totient is φ = 103444314624.

The previous prime is 388163780633. The next prime is 388163780647. The reversal of 388163780640 is 46087361883.

It is an interprime number because it is at equal distance from previous prime (388163780633) and next prime (388163780647).

It is a tau number, because it is divible by the number of its divisors (240).

It is a super-2 number, since 2×388163780640² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (388163780647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 22321389 + ... + 22338771.

Almost surely, 2^388163780640 is an apocalyptic number.

388163780640 is a gapful number since it is divisible by the number (30) 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 388163780640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (685384295904).

388163780640 is an abundant number, since it is smaller than the sum of its proper divisors (982604811168).

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

388163780640 is a wasteful number, since it uses less digits than its factorization.

388163780640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19133 (or 19116 counting only the distinct ones).

The product of its (nonzero) digits is 4644864, while the sum is 54.

The spelling of 388163780640 in words is "three hundred eighty-eight billion, one hundred sixty-three million, seven hundred eighty thousand, six hundred forty".