4081720188 has 144 divisors (see below), whose sum is σ = 12343272480. Its totient is φ = 1039320576.

The previous prime is 4081720187. The next prime is 4081720193. The reversal of 4081720188 is 8810271804.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4081720187) 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, 212470 + ... + 230882.

It is an arithmetic number, because the mean of its divisors is an integer number (85717170).

Almost surely, 2^4081720188 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 4081720188, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6171636240).

4081720188 is an abundant number, since it is smaller than the sum of its proper divisors (8261552292).

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

4081720188 is a wasteful number, since it uses less digits than its factorization.

4081720188 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18476 (or 18467 counting only the distinct ones).

The product of its (nonzero) digits is 28672, while the sum is 39.

The square root of 4081720188 is about 63888.3415655783. The cubic root of 4081720188 is about 1598.1384845442.

The spelling of 4081720188 in words is "four billion, eighty-one million, seven hundred twenty thousand, one hundred eighty-eight".