1666764 has 96 divisors (see below), whose sum is σ = 4999680. Its totient is φ = 475200.

The previous prime is 1666757. The next prime is 1666771. The reversal of 1666764 is 4676661.

It is an interprime number because it is at equal distance from previous prime (1666757) and next prime (1666771).

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

Its product of digits (36288) is a multiple of the sum of its prime factors (108).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 27294 + ... + 27354.

It is an arithmetic number, because the mean of its divisors is an integer number (52080).

2^1666764 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 1666764, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2499840).

1666764 is an abundant number, since it is smaller than the sum of its proper divisors (3332916).

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

1666764 is a wasteful number, since it uses less digits than its factorization.

1666764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108 (or 100 counting only the distinct ones).

The product of its digits is 36288, while the sum is 36.

The square root of 1666764 is about 1291.0321452233. The cubic root of 1666764 is about 118.5654181333.

The spelling of 1666764 in words is "one million, six hundred sixty-six thousand, seven hundred sixty-four".