655331040 has 384 divisors, whose sum is σ = 2824657920. Its totient is φ = 138184704.

The previous prime is 655331021. The next prime is 655331057. The reversal of 655331040 is 40133556.

655331040 is a `hidden beast` number, since 6 + 553 + 3 + 104 + 0 = 666.

655331040 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 655330995 and 655331013.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 392287 + ... + 393953.

It is an arithmetic number, because the mean of its divisors is an integer number (7355880).

Almost surely, 2^655331040 is an apocalyptic number.

655331040 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 655331040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1412328960).

655331040 is an abundant number, since it is smaller than the sum of its proper divisors (2169326880).

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

655331040 is a wasteful number, since it uses less digits than its factorization.

655331040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1711 (or 1697 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 27.

The square root of 655331040 is about 25599.4343687512. The cubic root of 655331040 is about 868.6008426014.

Adding to 655331040 its reverse (40133556), we get a palindrome (695464596).

The spelling of 655331040 in words is "six hundred fifty-five million, three hundred thirty-one thousand, forty".