1780066 has 8 divisors (see below), whose sum is σ = 2687580. Its totient is φ = 884208.

The previous prime is 1780061. The next prime is 1780067. The reversal of 1780066 is 6600871.

It can be written as a sum of positive squares in 2 ways, for example, as 1677025 + 103041 = 1295^2 + 321^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (1780061) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2521 + ... + 3148.

2^1780066 is an apocalyptic number.

1780066 is a deficient number, since it is larger than the sum of its proper divisors (907514).

1780066 is a wasteful number, since it uses less digits than its factorization.

1780066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5828.

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 1780066 is about 1334.1911407291. The cubic root of 1780066 is about 121.1933252686.

The spelling of 1780066 in words is "one million, seven hundred eighty thousand, sixty-six".