2646864 has 80 divisors (see below), whose sum is σ = 8303040. Its totient is φ = 800640.

The previous prime is 2646841. The next prime is 2646881. The reversal of 2646864 is 4686462.

It is a happy number.

2646864 is a `hidden beast` number, since 2 + 646 + 8 + 6 + 4 = 666.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

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, 4474 + ... + 5030.

It is an arithmetic number, because the mean of its divisors is an integer number (103788).

2^2646864 is an apocalyptic number.

2646864 is a gapful number since it is divisible by the number (24) 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 2646864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4151520).

2646864 is an abundant number, since it is smaller than the sum of its proper divisors (5656176).

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

2646864 is a wasteful number, since it uses less digits than its factorization.

2646864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 585 (or 573 counting only the distinct ones).

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

The square root of 2646864 is about 1626.9185597319. The cubic root of 2646864 is about 138.3281416093.

It can be divided in two parts, 2646 and 864, that multiplied together give a square (2286144 = 1512²).

The spelling of 2646864 in words is "two million, six hundred forty-six thousand, eight hundred sixty-four".