3891228672 has 104 divisors (see below), whose sum is σ = 10446604816. Its totient is φ = 1288175616.

The previous prime is 3891228637. The next prime is 3891228683. The reversal of 3891228672 is 2768221983.

3891228672 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1928208 + ... + 1930224.

Almost surely, 2^3891228672 is an apocalyptic number.

3891228672 is a gapful number since it is divisible by the number (32) 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 3891228672, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5223302408).

3891228672 is an abundant number, since it is smaller than the sum of its proper divisors (6555376144).

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

3891228672 is a wasteful number, since it uses less digits than its factorization.

3891228672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2201 (or 2179 counting only the distinct ones).

The product of its digits is 580608, while the sum is 48.

The square root of 3891228672 is about 62379.7136255049. The cubic root of 3891228672 is about 1572.8799791815.

The spelling of 3891228672 in words is "three billion, eight hundred ninety-one million, two hundred twenty-eight thousand, six hundred seventy-two".