653660 has 72 divisors (see below), whose sum is σ = 1723680. Its totient is φ = 206976.

The previous prime is 653659. The next prime is 653687. The reversal of 653660 is 66356.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 653660.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 22526 + ... + 22554.

It is an arithmetic number, because the mean of its divisors is an integer number (23940).

2⁶⁵³⁶⁶⁰ 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 653660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (861840).

653660 is an abundant number, since it is smaller than the sum of its proper divisors (1070020).

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

653660 is a wasteful number, since it uses less digits than its factorization.

653660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75 (or 66 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 26.

The square root of 653660 is about 808.4924242069. The cubic root of 653660 is about 86.7861927396.

The spelling of 653660 in words is "six hundred fifty-three thousand, six hundred sixty".