3778191920 has 80 divisors (see below), whose sum is σ = 9258960960. Its totient is φ = 1431585792.

The previous prime is 3778191917. The next prime is 3778191931. The reversal of 3778191920 is 291918773.

It is a tau number, because it is divible by the number of its divisors (80).

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, 107597 + ... + 138323.

It is an arithmetic number, because the mean of its divisors is an integer number (115737012).

Almost surely, 2^3778191920 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3778191920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4629480480).

3778191920 is an abundant number, since it is smaller than the sum of its proper divisors (5480769040).

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

3778191920 is a wasteful number, since it uses less digits than its factorization.

3778191920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30822 (or 30816 counting only the distinct ones).

The product of its (nonzero) digits is 190512, while the sum is 47.

The square root of 3778191920 is about 61466.9986252786. The cubic root of 3778191920 is about 1557.4998193899.

The spelling of 3778191920 in words is "three billion, seven hundred seventy-eight million, one hundred ninety-one thousand, nine hundred twenty".