3861891564 has 24 divisors (see below), whose sum is σ = 9541144368. Its totient is φ = 1211573760.

The previous prime is 3861891563. The next prime is 3861891571. The reversal of 3861891564 is 4651981683.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is not an unprimeable number, because it can be changed into a prime (3861891563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9465217 + ... + 9465624.

It is an arithmetic number, because the mean of its divisors is an integer number (397547682).

Almost surely, 2^3861891564 is an apocalyptic number.

3861891564 is a gapful number since it is divisible by the number (34) formed by its first and last digit.

It is an amenable number.

3861891564 is an abundant number, since it is smaller than the sum of its proper divisors (5679252804).

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

3861891564 is a wasteful number, since it uses less digits than its factorization.

3861891564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18930865 (or 18930863 counting only the distinct ones).

The product of its digits is 1244160, while the sum is 51.

The square root of 3861891564 is about 62144.1193034385. The cubic root of 3861891564 is about 1568.9172032721.

The spelling of 3861891564 in words is "three billion, eight hundred sixty-one million, eight hundred ninety-one thousand, five hundred sixty-four".