2644866 has 32 divisors (see below), whose sum is σ = 6718080. Its totient is φ = 755568.

The previous prime is 2644853. The next prime is 2644879. The reversal of 2644866 is 6684462.

It is a happy number.

2644866 is a `hidden beast` number, since 2 + 644 + 8 + 6 + 6 = 666.

It is an interprime number because it is at equal distance from previous prime (2644853) and next prime (2644879).

It is a self number, because there is not a number n which added to its sum of digits gives 2644866.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3121 + ... + 3876.

It is an arithmetic number, because the mean of its divisors is an integer number (209940).

2^2644866 is an apocalyptic number.

2644866 is an abundant number, since it is smaller than the sum of its proper divisors (4073214).

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

2644866 is a wasteful number, since it uses less digits than its factorization.

2644866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7015 (or 7009 counting only the distinct ones).

The product of its digits is 55296, while the sum is 36.

The square root of 2644866 is about 1626.3043995513. The cubic root of 2644866 is about 138.2933269257.

The spelling of 2644866 in words is "two million, six hundred forty-four thousand, eight hundred sixty-six".