690520 has 32 divisors (see below), whose sum is σ = 1584720. Its totient is φ = 270720.

The previous prime is 690511. The next prime is 690533. The reversal of 690520 is 25096.

It is a junction number, because it is equal to n+sod(n) for n = 690491 and 690500.

It is a congruent number.

It is an unprimeable number.

690520 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 7 ways as a sum of consecutive naturals, for example, 2299 + ... + 2581.

2⁶⁹⁰⁵²⁰ 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 690520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (792360).

690520 is an abundant number, since it is smaller than the sum of its proper divisors (894200).

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

690520 is a wasteful number, since it uses less digits than its factorization.

690520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 355 (or 351 counting only the distinct ones).

The product of its (nonzero) digits is 540, while the sum is 22.

The square root of 690520 is about 830.9753305604. The cubic root of 690520 is about 88.3877517615.

The spelling of 690520 in words is "six hundred ninety thousand, five hundred twenty".