2128273640 has 64 divisors (see below), whose sum is σ = 4846003200. Its totient is φ = 841157632.

The previous prime is 2128273613. The next prime is 2128273669. The reversal of 2128273640 is 463728212.

It is a self number, because there is not a number n which added to its sum of digits gives 2128273640.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2164589 + ... + 2165571.

It is an arithmetic number, because the mean of its divisors is an integer number (75718800).

Almost surely, 2^2128273640 is an apocalyptic number.

2128273640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2128273640 is an abundant number, since it is smaller than the sum of its proper divisors (2717729560).

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

2128273640 is a wasteful number, since it uses less digits than its factorization.

2128273640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1586 (or 1582 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 35.

The square root of 2128273640 is about 46133.2162329920. The cubic root of 2128273640 is about 1286.3006487800.

The spelling of 2128273640 in words is "two billion, one hundred twenty-eight million, two hundred seventy-three thousand, six hundred forty".