655731040 has 96 divisors (see below), whose sum is σ = 1670790240. Its totient is φ = 242380800.

The previous prime is 655731031. The next prime is 655731053. The reversal of 655731040 is 40137556.

655731040 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 655730993 and 655731011.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 122010 + ... + 127270.

It is an arithmetic number, because the mean of its divisors is an integer number (17404065).

Almost surely, 2^655731040 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 655731040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (835395120).

655731040 is an abundant number, since it is smaller than the sum of its proper divisors (1015059200).

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

655731040 is a wasteful number, since it uses less digits than its factorization.

655731040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5336 (or 5328 counting only the distinct ones).

The product of its (nonzero) digits is 12600, while the sum is 31.

The square root of 655731040 is about 25607.2458495638. The cubic root of 655731040 is about 868.7775317604. Note that the first 3 decimals are identical.

Adding to 655731040 its reverse (40137556), we get a palindrome (695868596).

The spelling of 655731040 in words is "six hundred fifty-five million, seven hundred thirty-one thousand, forty".