4001555888 has 80 divisors (see below), whose sum is σ = 8762772480. Its totient is φ = 1753747200.

The previous prime is 4001555881. The next prime is 4001555903. The reversal of 4001555888 is 8885551004.

4001555888 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 (44).

It is not an unprimeable number, because it can be changed into a prime (4001555881) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1673798 + ... + 1676186.

It is an arithmetic number, because the mean of its divisors is an integer number (109534656).

Almost surely, 2^4001555888 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 4001555888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4381386240).

4001555888 is an abundant number, since it is smaller than the sum of its proper divisors (4761216592).

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

4001555888 is a wasteful number, since it uses less digits than its factorization.

4001555888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2746 (or 2740 counting only the distinct ones).

The product of its (nonzero) digits is 256000, while the sum is 44.

The square root of 4001555888 is about 63257.8523821351. The cubic root of 4001555888 is about 1587.6068434755.

The spelling of 4001555888 in words is "four billion, one million, five hundred fifty-five thousand, eight hundred eighty-eight".