2215780 has 96 divisors (see below), whose sum is σ = 6048000. Its totient is φ = 677376.

The previous prime is 2215777. The next prime is 2215783. The reversal of 2215780 is 875122.

2215780 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (2215777) and next prime (2215783).

It is not an unprimeable number, because it can be changed into a prime (2215783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 116611 + ... + 116629.

It is an arithmetic number, because the mean of its divisors is an integer number (63000).

2^2215780 is an apocalyptic number.

2215780 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 2215780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3024000).

2215780 is an abundant number, since it is smaller than the sum of its proper divisors (3832220).

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

2215780 is a wasteful number, since it uses less digits than its factorization.

2215780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66 (or 50 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 25.

The square root of 2215780 is about 1488.5496296731. The cubic root of 2215780 is about 130.3693637490.

The spelling of 2215780 in words is "two million, two hundred fifteen thousand, seven hundred eighty".