1781064 has 48 divisors (see below), whose sum is σ = 4995900. Its totient is φ = 572544.

The previous prime is 1781063. The next prime is 1781089. The reversal of 1781064 is 4601871.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1664100 + 116964 = 1290^2 + 342^2 .

It is not an unprimeable number, because it can be changed into a prime (1781063) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1662 + ... + 2514.

2^1781064 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 1781064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2497950).

1781064 is an abundant number, since it is smaller than the sum of its proper divisors (3214836).

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

1781064 is a wasteful number, since it uses less digits than its factorization.

1781064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 894 (or 887 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 27.

The square root of 1781064 is about 1334.5650977004. The cubic root of 1781064 is about 121.2159701859.

The spelling of 1781064 in words is "one million, seven hundred eighty-one thousand, sixty-four".