662778 has 12 divisors (see below), whose sum is σ = 1436058. Its totient is φ = 220920.

The previous prime is 662773. The next prime is 662789. The reversal of 662778 is 877266.

It can be written as a sum of positive squares in only one way, i.e., 603729 + 59049 = 777^2 + 243^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (662771) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 18393 + ... + 18428.

2⁶⁶²⁷⁷⁸ is an apocalyptic number.

662778 is an abundant number, since it is smaller than the sum of its proper divisors (773280).

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

662778 is a wasteful number, since it uses less digits than its factorization.

662778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36829 (or 36826 counting only the distinct ones).

The product of its digits is 28224, while the sum is 36.

The square root of 662778 is about 814.1117859361. Note that the first 3 decimals coincide. The cubic root of 662778 is about 87.1878619864.

The spelling of 662778 in words is "six hundred sixty-two thousand, seven hundred seventy-eight".