2271780 has 96 divisors (see below), whose sum is σ = 8090880. Its totient is φ = 518400.

The previous prime is 2271767. The next prime is 2271781. The reversal of 2271780 is 871722.

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

It is not an unprimeable number, because it can be changed into a prime (2271781) 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, 3480 + ... + 4080.

It is an arithmetic number, because the mean of its divisors is an integer number (84280).

2^2271780 is an apocalyptic number.

2271780 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 2271780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4045440).

2271780 is an abundant number, since it is smaller than the sum of its proper divisors (5819100).

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

2271780 is a wasteful number, since it uses less digits than its factorization.

2271780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 626 (or 618 counting only the distinct ones).

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

The square root of 2271780 is about 1507.2425153239. The cubic root of 2271780 is about 131.4585256687.

The spelling of 2271780 in words is "two million, two hundred seventy-one thousand, seven hundred eighty".