2138564788 has 6 divisors (see below), whose sum is σ = 3742488386. Its totient is φ = 1069282392.

The previous prime is 2138564783. The next prime is 2138564789. The reversal of 2138564788 is 8874658312.

It can be written as a sum of positive squares in only one way, i.e., 1708334224 + 430230564 = 41332^2 + 20742^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2138564783) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 267320595 + ... + 267320602.

Almost surely, 2^2138564788 is an apocalyptic number.

It is an amenable number.

2138564788 is a deficient number, since it is larger than the sum of its proper divisors (1603923598).

2138564788 is a wasteful number, since it uses less digits than its factorization.

2138564788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 534641201 (or 534641199 counting only the distinct ones).

The product of its digits is 2580480, while the sum is 52.

The square root of 2138564788 is about 46244.6190167029. The cubic root of 2138564788 is about 1288.3705942389.

The spelling of 2138564788 in words is "two billion, one hundred thirty-eight million, five hundred sixty-four thousand, seven hundred eighty-eight".