3891545856 has 432 divisors, whose sum is σ = 13070873088. Its totient is φ = 1154165760.

The previous prime is 3891545851. The next prime is 3891545891. The reversal of 3891545856 is 6585451983.

3891545856 is a `hidden beast` number, since 3 + 8 + 9 + 1 + 54 + 585 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (432).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3891545851) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 82798825 + ... + 82798871.

Almost surely, 2^3891545856 is an apocalyptic number.

3891545856 is a gapful number since it is divisible by the number (36) 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 3891545856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6535436544).

3891545856 is an abundant number, since it is smaller than the sum of its proper divisors (9179327232).

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

3891545856 is an frugal number, since it uses more digits than its factorization.

3891545856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111 (or 63 counting only the distinct ones).

The product of its digits is 5184000, while the sum is 54.

The square root of 3891545856 is about 62382.2559386882. The cubic root of 3891545856 is about 1572.9227145102.

The spelling of 3891545856 in words is "three billion, eight hundred ninety-one million, five hundred forty-five thousand, eight hundred fifty-six".