2771280 has 80 divisors (see below), whose sum is σ = 9552960. Its totient is φ = 738432.

The previous prime is 2771273. The next prime is 2771281. The reversal of 2771280 is 821772.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2771281) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1519 + ... + 2801.

It is an arithmetic number, because the mean of its divisors is an integer number (119412).

2^2771280 is an apocalyptic number.

2771280 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 2771280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4776480).

2771280 is an abundant number, since it is smaller than the sum of its proper divisors (6781680).

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

2771280 is a wasteful number, since it uses less digits than its factorization.

2771280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1305 (or 1293 counting only the distinct ones).

The product of its (nonzero) digits is 1568, while the sum is 27.

The square root of 2771280 is about 1664.7161920279. The cubic root of 2771280 is about 140.4624165462.

The spelling of 2771280 in words is "two million, seven hundred seventy-one thousand, two hundred eighty".