2155027784 has 128 divisors (see below), whose sum is σ = 5093383680. Its totient is φ = 832204800.

The previous prime is 2155027769. The next prime is 2155027789. The reversal of 2155027784 is 4877205512.

It is not an unprimeable number, because it can be changed into a prime (2155027789) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8941904 + ... + 8942144.

It is an arithmetic number, because the mean of its divisors is an integer number (39792060).

Almost surely, 2^2155027784 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 2155027784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2546691840).

2155027784 is an abundant number, since it is smaller than the sum of its proper divisors (2938355896).

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

2155027784 is a wasteful number, since it uses less digits than its factorization.

2155027784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 511 (or 507 counting only the distinct ones).

The product of its (nonzero) digits is 156800, while the sum is 41.

The square root of 2155027784 is about 46422.2768075845. The cubic root of 2155027784 is about 1291.6681709720.

The spelling of 2155027784 in words is "two billion, one hundred fifty-five million, twenty-seven thousand, seven hundred eighty-four".