2775238164 has 18 divisors (see below), whose sum is σ = 7015185450. Its totient is φ = 925079376.

The previous prime is 2775238157. The next prime is 2775238177. The reversal of 2775238164 is 4618325772.

It can be written as a sum of positive squares in only one way, i.e., 2740522500 + 34715664 = 52350^2 + 5892^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 38544939 + ... + 38545010.

It is an arithmetic number, because the mean of its divisors is an integer number (389732525).

Almost surely, 2^2775238164 is an apocalyptic number.

It is an amenable number.

2775238164 is an abundant number, since it is smaller than the sum of its proper divisors (4239947286).

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

2775238164 is a wasteful number, since it uses less digits than its factorization.

2775238164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77089959 (or 77089954 counting only the distinct ones).

The product of its digits is 564480, while the sum is 45.

The square root of 2775238164 is about 52680.5292684119. The cubic root of 2775238164 is about 1405.2925795704.

The spelling of 2775238164 in words is "two billion, seven hundred seventy-five million, two hundred thirty-eight thousand, one hundred sixty-four".