2215688 has 8 divisors (see below), whose sum is σ = 4154430. Its totient is φ = 1107840.

The previous prime is 2215673. The next prime is 2215691. The reversal of 2215688 is 8865122.

It can be written as a sum of positive squares in only one way, i.e., 1444804 + 770884 = 1202^2 + 878^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 138473 + ... + 138488.

2^2215688 is an apocalyptic number.

It is an amenable number.

2215688 is a deficient number, since it is larger than the sum of its proper divisors (1938742).

2215688 is a wasteful number, since it uses less digits than its factorization.

2215688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 276967 (or 276963 counting only the distinct ones).

The product of its digits is 7680, while the sum is 32.

The square root of 2215688 is about 1488.5187267885. The cubic root of 2215688 is about 130.3675593960.

The spelling of 2215688 in words is "two million, two hundred fifteen thousand, six hundred eighty-eight".