690880 has 56 divisors (see below), whose sum is σ = 1755648. Its totient is φ = 258048.

The previous prime is 690871. The next prime is 690887. The reversal of 690880 is 88096.

690880 = 1² + 2² + ... + 127².

It is not an unprimeable number, because it can be changed into a prime (690887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5377 + ... + 5503.

2⁶⁹⁰⁸⁸⁰ 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 690880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (877824).

690880 is an abundant number, since it is smaller than the sum of its proper divisors (1064768).

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

690880 is a wasteful number, since it uses less digits than its factorization.

690880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161 (or 151 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 690880 is about 831.1919152639. The cubic root of 690880 is about 88.4031093001.

The spelling of 690880 in words is "six hundred ninety thousand, eight hundred eighty".