655235840 has 216 divisors, whose sum is σ = 1890225792. Its totient is φ = 216760320.

The previous prime is 655235837. The next prime is 655235851. The reversal of 655235840 is 48532556.

It is a junction number, because it is equal to n+sod(n) for n = 655235794 and 655235803.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1944152 + ... + 1944488.

Almost surely, 2^655235840 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 655235840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (945112896).

655235840 is an abundant number, since it is smaller than the sum of its proper divisors (1234989952).

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

655235840 is a wasteful number, since it uses less digits than its factorization.

655235840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 403 (or 382 counting only the distinct ones).

The product of its (nonzero) digits is 144000, while the sum is 38.

The square root of 655235840 is about 25597.5748851332. The cubic root of 655235840 is about 868.5587799899.

The spelling of 655235840 in words is "six hundred fifty-five million, two hundred thirty-five thousand, eight hundred forty".