3881631820 has 48 divisors (see below), whose sum is σ = 9005068800. Its totient is φ = 1393629120.

The previous prime is 3881631791. The next prime is 3881631839. The reversal of 3881631820 is 281361883.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 94290 + ... + 129049.

It is an arithmetic number, because the mean of its divisors is an integer number (187605600).

Almost surely, 2^3881631820 is an apocalyptic number.

It is an amenable number.

3881631820 is an abundant number, since it is smaller than the sum of its proper divisors (5123436980).

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

3881631820 is a wasteful number, since it uses less digits than its factorization.

3881631820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223438 (or 223436 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 40.

The square root of 3881631820 is about 62302.7432782859. The cubic root of 3881631820 is about 1571.5858615717.

It can be divided in two parts, 388163 and 1820, that added together give a palindrome (389983).

The spelling of 3881631820 in words is "three billion, eight hundred eighty-one million, six hundred thirty-one thousand, eight hundred twenty".