2128440587 has 36 divisors (see below), whose sum is σ = 2773811520. Its totient is φ = 1625787072.

The previous prime is 2128440581. The next prime is 2128440619. The reversal of 2128440587 is 7850448212.

It is not a de Polignac number, because 2128440587 - 2⁴ = 2128440571 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2128440581) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 235718 + ... + 244580.

It is an arithmetic number, because the mean of its divisors is an integer number (77050320).

Almost surely, 2^2128440587 is an apocalyptic number.

2128440587 is a deficient number, since it is larger than the sum of its proper divisors (645370933).

2128440587 is a wasteful number, since it uses less digits than its factorization.

2128440587 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8932 (or 8912 counting only the distinct ones).

The product of its (nonzero) digits is 143360, while the sum is 41.

The square root of 2128440587 is about 46135.0255987791. The cubic root of 2128440587 is about 1286.3342814257.

Adding to 2128440587 its reverse (7850448212), we get a palindrome (9978888799).

The spelling of 2128440587 in words is "two billion, one hundred twenty-eight million, four hundred forty thousand, five hundred eighty-seven".