690420 has 48 divisors (see below), whose sum is σ = 1991808. Its totient is φ = 178560.

The previous prime is 690419. The next prime is 690427. The reversal of 690420 is 24096.

It is a nialpdrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (690427) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2065 + ... + 2375.

It is an arithmetic number, because the mean of its divisors is an integer number (41496).

2⁶⁹⁰⁴²⁰ is an apocalyptic number.

690420 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 690420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (995904).

690420 is an abundant number, since it is smaller than the sum of its proper divisors (1301388).

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

690420 is a wasteful number, since it uses less digits than its factorization.

690420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 360 (or 358 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 690420 is about 830.9151581239. The cubic root of 690420 is about 88.3834848313.

The spelling of 690420 in words is "six hundred ninety thousand, four hundred twenty".