655302240 has 144 divisors (see below), whose sum is σ = 2257648848. Its totient is φ = 173073408.

The previous prime is 655302157. The next prime is 655302251. The reversal of 655302240 is 42203556.

655302240 is a `hidden beast` number, since 655 + 3 + 0 + 2 + 2 + 4 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

It is a congruent number.

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, 151954 + ... + 156206.

It is an arithmetic number, because the mean of its divisors is an integer number (15678117).

Almost surely, 2^655302240 is an apocalyptic number.

655302240 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 655302240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1128824424).

655302240 is an abundant number, since it is smaller than the sum of its proper divisors (1602346608).

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

655302240 is a wasteful number, since it uses less digits than its factorization.

655302240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4381 (or 4370 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 27.

The square root of 655302240 is about 25598.8718501421. The cubic root of 655302240 is about 868.5881182075.

Adding to 655302240 its reverse (42203556), we get a palindrome (697505796).

The spelling of 655302240 in words is "six hundred fifty-five million, three hundred two thousand, two hundred forty".