2215764 has 36 divisors (see below), whose sum is σ = 5698420. Its totient is φ = 725760.

The previous prime is 2215699. The next prime is 2215777. The reversal of 2215764 is 4675122.

2215764 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 311364 + 1904400 = 558^2 + 1380^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×2215764² = 9819220207392, which contains 22 as substring.

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 1692 + ... + 2700.

2^2215764 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2215764, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2849210).

2215764 is an abundant number, since it is smaller than the sum of its proper divisors (3482656).

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

2215764 is a wasteful number, since it uses less digits than its factorization.

2215764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1080 (or 1075 counting only the distinct ones).

The product of its digits is 3360, while the sum is 27.

The square root of 2215764 is about 1488.5442553045. The cubic root of 2215764 is about 130.3690499520.

The spelling of 2215764 in words is "two million, two hundred fifteen thousand, seven hundred sixty-four".