655420144 has 40 divisors (see below), whose sum is σ = 1347592320. Its totient is φ = 308138688.

The previous prime is 655420141. The next prime is 655420163. The reversal of 655420144 is 441024556.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (655420141) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6619 + ... + 36805.

It is an arithmetic number, because the mean of its divisors is an integer number (33689808).

Almost surely, 2^655420144 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 655420144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (673796160).

655420144 is an abundant number, since it is smaller than the sum of its proper divisors (692172176).

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

655420144 is a wasteful number, since it uses less digits than its factorization.

655420144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30277 (or 30271 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 31.

The square root of 655420144 is about 25601.1746605502. The cubic root of 655420144 is about 868.6402081013.

The spelling of 655420144 in words is "six hundred fifty-five million, four hundred twenty thousand, one hundred forty-four".