2128369640 has 32 divisors (see below), whose sum is σ = 4820985000. Its totient is φ = 845631744.

The previous prime is 2128369603. The next prime is 2128369651. The reversal of 2128369640 is 469638212.

It can be written as a sum of positive squares in 4 ways, for example, as 1648847236 + 479522404 = 40606^2 + 21898^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 172595 + ... + 184514.

Almost surely, 2^2128369640 is an apocalyptic number.

2128369640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2128369640 is an abundant number, since it is smaller than the sum of its proper divisors (2692615360).

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

2128369640 is a wasteful number, since it uses less digits than its factorization.

2128369640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 357269 (or 357265 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 41.

The square root of 2128369640 is about 46134.2566863280. The cubic root of 2128369640 is about 1286.3199888691.

The spelling of 2128369640 in words is "two billion, one hundred twenty-eight million, three hundred sixty-nine thousand, six hundred forty".