655827840 has 192 divisors, whose sum is σ = 2349088560. Its totient is φ = 174845952.

The previous prime is 655827827. The next prime is 655827863. The reversal of 655827840 is 48728556.

655827840 is a `hidden beast` number, since 65 + 582 + 7 + 8 + 4 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (192).

It is a super-2 number, since 2×655827840² = 860220311438131200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 153412 + ... + 157628.

Almost surely, 2^655827840 is an apocalyptic number.

655827840 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 655827840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1174544280).

655827840 is an abundant number, since it is smaller than the sum of its proper divisors (1693260720).

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

655827840 is an equidigital number, since it uses as much as digits as its factorization.

655827840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4251 (or 4227 counting only the distinct ones).

The product of its (nonzero) digits is 537600, while the sum is 45.

The square root of 655827840 is about 25609.1358698415. The cubic root of 655827840 is about 868.8202797378.

The spelling of 655827840 in words is "six hundred fifty-five million, eight hundred twenty-seven thousand, eight hundred forty".