2775721560 has 128 divisors (see below), whose sum is σ = 8486138880. Its totient is φ = 726156288.

The previous prime is 2775721549. The next prime is 2775721567. The reversal of 2775721560 is 651275772.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2775721567) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2515969 + ... + 2517071.

It is an arithmetic number, because the mean of its divisors is an integer number (66297960).

Almost surely, 2^2775721560 is an apocalyptic number.

2775721560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2775721560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4243069440).

2775721560 is an abundant number, since it is smaller than the sum of its proper divisors (5710417320).

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

2775721560 is a wasteful number, since it uses less digits than its factorization.

2775721560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1497 (or 1493 counting only the distinct ones).

The product of its (nonzero) digits is 205800, while the sum is 42.

The square root of 2775721560 is about 52685.1170635503. The cubic root of 2775721560 is about 1405.3741669674.

The spelling of 2775721560 in words is "two billion, seven hundred seventy-five million, seven hundred twenty-one thousand, five hundred sixty".