655503240 has 256 divisors, whose sum is σ = 2363904000. Its totient is φ = 142248960.

The previous prime is 655503229. The next prime is 655503241. The reversal of 655503240 is 42305556.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 655503198 and 655503207.

It is not an unprimeable number, because it can be changed into a prime (655503241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1729371 + ... + 1729749.

It is an arithmetic number, because the mean of its divisors is an integer number (9234000).

Almost surely, 2^655503240 is an apocalyptic number.

655503240 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 655503240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1181952000).

655503240 is an abundant number, since it is smaller than the sum of its proper divisors (1708400760).

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

655503240 is a wasteful number, since it uses less digits than its factorization.

655503240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 500 (or 496 counting only the distinct ones).

The product of its (nonzero) digits is 18000, while the sum is 30.

The square root of 655503240 is about 25602.7975033979. The cubic root of 655503240 is about 868.6769160955.

Adding to 655503240 its reverse (42305556), we get a palindrome (697808796).

The spelling of 655503240 in words is "six hundred fifty-five million, five hundred three thousand, two hundred forty".