653720 has 32 divisors (see below), whose sum is σ = 1501200. Its totient is φ = 256128.

The previous prime is 653713. The next prime is 653743. The reversal of 653720 is 27356.

It is a congruent number.

It is an unprimeable number.

653720 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2222 + ... + 2498.

2⁶⁵³⁷²⁰ 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 653720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (750600).

653720 is an abundant number, since it is smaller than the sum of its proper divisors (847480).

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

653720 is a wasteful number, since it uses less digits than its factorization.

653720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 347 (or 343 counting only the distinct ones).

The product of its (nonzero) digits is 1260, while the sum is 23.

The square root of 653720 is about 808.5295294546. The cubic root of 653720 is about 86.7888480509.

The spelling of 653720 in words is "six hundred fifty-three thousand, seven hundred twenty".