3861662720 has 88 divisors (see below), whose sum is σ = 9285192000. Its totient is φ = 1541046272.

The previous prime is 3861662699. The next prime is 3861662759. The reversal of 3861662720 is 272661683.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3680756 + ... + 3681804.

Almost surely, 2^3861662720 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3861662720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4642596000).

3861662720 is an abundant number, since it is smaller than the sum of its proper divisors (5423529280).

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

3861662720 is a wasteful number, since it uses less digits than its factorization.

3861662720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1793 (or 1775 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 41.

The square root of 3861662720 is about 62142.2780399946. The cubic root of 3861662720 is about 1568.8862128990.

The spelling of 3861662720 in words is "three billion, eight hundred sixty-one million, six hundred sixty-two thousand, seven hundred twenty".