3865641020 has 24 divisors (see below), whose sum is σ = 8121423744. Its totient is φ = 1545574976.

The previous prime is 3865641011. The next prime is 3865641023. The reversal of 3865641020 is 201465683.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3865641023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5237 + ... + 88083.

It is an arithmetic number, because the mean of its divisors is an integer number (338392656).

Almost surely, 2^3865641020 is an apocalyptic number.

It is an amenable number.

3865641020 is an abundant number, since it is smaller than the sum of its proper divisors (4255782724).

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

3865641020 is a wasteful number, since it uses less digits than its factorization.

3865641020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85189 (or 85187 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 35.

The square root of 3865641020 is about 62174.2794087716. The cubic root of 3865641020 is about 1569.4247855606.

The spelling of 3865641020 in words is "three billion, eight hundred sixty-five million, six hundred forty-one thousand, twenty".