655580340 has 72 divisors (see below), whose sum is σ = 1999801440. Its totient is φ = 173836224.

The previous prime is 655580297. The next prime is 655580381. The reversal of 655580340 is 43085556.

655580340 is a `hidden beast` number, since 65 + 558 + 0 + 3 + 40 = 666.

655580340 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 (36).

It is a junction number, because it is equal to n+sod(n) for n = 655580295 and 655580304.

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, 22047 + ... + 42393.

It is an arithmetic number, because the mean of its divisors is an integer number (27775020).

Almost surely, 2^655580340 is an apocalyptic number.

655580340 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 655580340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (999900720).

655580340 is an abundant number, since it is smaller than the sum of its proper divisors (1344221100).

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

655580340 is a wasteful number, since it uses less digits than its factorization.

655580340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20541 (or 20536 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 36.

The square root of 655580340 is about 25604.3031539622. The cubic root of 655580340 is about 868.7109725580.

The spelling of 655580340 in words is "six hundred fifty-five million, five hundred eighty thousand, three hundred forty".