388665224640 has 672 divisors, whose sum is σ = 1740000787200. Its totient is φ = 80760637440.

The previous prime is 388665224611. The next prime is 388665224657. The reversal of 388665224640 is 46422566883.

It is a happy number.

388665224640 is a `hidden beast` number, since 38 + 8 + 6 + 6 + 522 + 46 + 40 = 666.

It is a tau number, because it is divible by the number of its divisors (672).

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

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, 4615231 + ... + 4698689.

Almost surely, 2^388665224640 is an apocalyptic number.

388665224640 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 388665224640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (870000393600).

388665224640 is an abundant number, since it is smaller than the sum of its proper divisors (1351335562560).

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

388665224640 is a wasteful number, since it uses less digits than its factorization.

388665224640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83510 (or 83487 counting only the distinct ones).

The product of its (nonzero) digits is 13271040, while the sum is 54.

The spelling of 388665224640 in words is "three hundred eighty-eight billion, six hundred sixty-five million, two hundred twenty-four thousand, six hundred forty".