655535720 has 192 divisors, whose sum is σ = 1871424000. Its totient is φ = 205244928.

The previous prime is 655535711. The next prime is 655535723. The reversal of 655535720 is 27535556.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (655535723) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1079657 + ... + 1080263.

It is an arithmetic number, because the mean of its divisors is an integer number (9747000).

Almost surely, 2^655535720 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 655535720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (935712000).

655535720 is an abundant number, since it is smaller than the sum of its proper divisors (1215888280).

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

655535720 is a wasteful number, since it uses less digits than its factorization.

655535720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 680 (or 669 counting only the distinct ones).

The product of its (nonzero) digits is 157500, while the sum is 38.

The square root of 655535720 is about 25603.4318012254. The cubic root of 655535720 is about 868.6912634236.

The spelling of 655535720 in words is "six hundred fifty-five million, five hundred thirty-five thousand, seven hundred twenty".