2155187328 has 192 divisors, whose sum is σ = 6908109120. Its totient is φ = 583096320.

The previous prime is 2155187267. The next prime is 2155187339. The reversal of 2155187328 is 8237815512.

It is a tau number, because it is divible by the number of its divisors (192).

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a self number, because there is not a number n which added to its sum of digits gives 2155187328.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 969258 + ... + 971478.

It is an arithmetic number, because the mean of its divisors is an integer number (35979735).

Almost surely, 2^2155187328 is an apocalyptic number.

2155187328 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2155187328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3454054560).

2155187328 is an abundant number, since it is smaller than the sum of its proper divisors (4752921792).

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

2155187328 is a wasteful number, since it uses less digits than its factorization.

2155187328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2283 (or 2252 counting only the distinct ones).

The product of its digits is 134400, while the sum is 42.

The square root of 2155187328 is about 46423.9951749093. The cubic root of 2155187328 is about 1291.7000457074.

The spelling of 2155187328 in words is "two billion, one hundred fifty-five million, one hundred eighty-seven thousand, three hundred twenty-eight".