2164378728 has 16 divisors (see below), whose sum is σ = 5410946880. Its totient is φ = 721459568.

The previous prime is 2164378693. The next prime is 2164378747. The reversal of 2164378728 is 8278734612.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45091200 + ... + 45091247.

It is an arithmetic number, because the mean of its divisors is an integer number (338184180).

Almost surely, 2^2164378728 is an apocalyptic number.

It is an amenable number.

2164378728 is an abundant number, since it is smaller than the sum of its proper divisors (3246568152).

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

2164378728 is a wasteful number, since it uses less digits than its factorization.

2164378728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90182456 (or 90182452 counting only the distinct ones).

The product of its digits is 903168, while the sum is 48.

The square root of 2164378728 is about 46522.8839174873. The cubic root of 2164378728 is about 1293.5337136535.

The spelling of 2164378728 in words is "two billion, one hundred sixty-four million, three hundred seventy-eight thousand, seven hundred twenty-eight".