2188764 has 36 divisors (see below), whose sum is σ = 5581576. Its totient is φ = 723168.

The previous prime is 2188757. The next prime is 2188783. The reversal of 2188764 is 4678812.

2188764 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

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

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, 5682 + ... + 6054.

2^2188764 is an apocalyptic number.

It is an amenable number.

2188764 is an abundant number, since it is smaller than the sum of its proper divisors (3392812).

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

2188764 is a wasteful number, since it uses less digits than its factorization.

2188764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 546 (or 541 counting only the distinct ones).

The product of its digits is 21504, while the sum is 36.

The square root of 2188764 is about 1479.4471940559. The cubic root of 2188764 is about 129.8373508274.

The spelling of 2188764 in words is "two million, one hundred eighty-eight thousand, seven hundred sixty-four".