388732680 has 144 divisors (see below), whose sum is σ = 1469714220. Its totient is φ = 88849152.

The previous prime is 388732679. The next prime is 388732681. The reversal of 388732680 is 86237883.

388732680 is a `hidden beast` number, since 388 + 7 + 3 + 268 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (388732679) and next prime (388732681).

It can be written as a sum of positive squares in 2 ways, for example, as 355624164 + 33108516 = 18858^2 + 5754^2 .

It is a super-2 number, since 2×388732680² = 302226192999964800, which contains 22 as substring.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (388732681) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 6622 + ... + 28658.

Almost surely, 2^388732680 is an apocalyptic number.

388732680 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 388732680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (734857110).

388732680 is an abundant number, since it is smaller than the sum of its proper divisors (1080981540).

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

388732680 is a wasteful number, since it uses less digits than its factorization.

388732680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22068 (or 22054 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 45.

The square root of 388732680 is about 19716.3049276481. The cubic root of 388732680 is about 729.8221121568.

The spelling of 388732680 in words is "three hundred eighty-eight million, seven hundred thirty-two thousand, six hundred eighty".