3886686720 has 640 divisors, whose sum is σ = 16381094400. Its totient is φ = 854654976.

The previous prime is 3886686707. The next prime is 3886686731. The reversal of 3886686720 is 276866883.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (640).

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

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 14031222 + ... + 14031498.

It is an arithmetic number, because the mean of its divisors is an integer number (25595460).

Almost surely, 2^3886686720 is an apocalyptic number.

3886686720 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 3886686720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8190547200).

3886686720 is an abundant number, since it is smaller than the sum of its proper divisors (12494407680).

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

3886686720 is a wasteful number, since it uses less digits than its factorization.

3886686720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 345 (or 323 counting only the distinct ones).

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

The square root of 3886686720 is about 62343.2973141460. The cubic root of 3886686720 is about 1572.2677709467.

The spelling of 3886686720 in words is "three billion, eight hundred eighty-six million, six hundred eighty-six thousand, seven hundred twenty".