4027640838 has 64 divisors (see below), whose sum is σ = 9163241472. Its totient is φ = 1171376640.

The previous prime is 4027640801. The next prime is 4027640879. The reversal of 4027640838 is 8380467204.

It is a self number, because there is not a number n which added to its sum of digits gives 4027640838.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 84606 + ... + 123342.

It is an arithmetic number, because the mean of its divisors is an integer number (143175648).

Almost surely, 2^4027640838 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 4027640838, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4581620736).

4027640838 is an abundant number, since it is smaller than the sum of its proper divisors (5135600634).

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

4027640838 is a wasteful number, since it uses less digits than its factorization.

4027640838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38829.

The product of its (nonzero) digits is 258048, while the sum is 42.

The square root of 4027640838 is about 63463.6970086048. The cubic root of 4027640838 is about 1591.0490865428.

The spelling of 4027640838 in words is "four billion, twenty-seven million, six hundred forty thousand, eight hundred thirty-eight".