669800 has 48 divisors (see below), whose sum is σ = 1657260. Its totient is φ = 250880.

The previous prime is 669791. The next prime is 669839. The reversal of 669800 is 8966.

669800 = T₉ + T₁₀ + ... + T₁₅₈.

It can be written as a sum of positive squares in 6 ways, for example, as 538756 + 131044 = 734^2 + 362^2 .

It is an Ulam number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3302 + ... + 3498.

2⁶⁶⁹⁸⁰⁰ 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 669800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (828630).

669800 is an abundant number, since it is smaller than the sum of its proper divisors (987460).

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

669800 is a wasteful number, since it uses less digits than its factorization.

669800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230 (or 221 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 669800 is about 818.4130986244. The cubic root of 669800 is about 87.4946935557.

The spelling of 669800 in words is "six hundred sixty-nine thousand, eight hundred".