690800 has 60 divisors (see below), whose sum is σ = 1822056. Its totient is φ = 249600.

The previous prime is 690793. The next prime is 690817. The reversal of 690800 is 8096.

Added to its reverse (8096) it gives a square (698896 = 836²).

It is a congruent number.

It is an unprimeable number.

690800 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4322 + ... + 4478.

2⁶⁹⁰⁸⁰⁰ 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 690800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (911028).

690800 is an abundant number, since it is smaller than the sum of its proper divisors (1131256).

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

690800 is a wasteful number, since it uses less digits than its factorization.

690800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186 (or 175 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 690800 is about 831.1437902072. The cubic root of 690800 is about 88.3996969749.

Adding to 690800 its reverse (8096), we get a palindrome (698896).

The spelling of 690800 in words is "six hundred ninety thousand, eight hundred".