655231680 has 280 divisors, whose sum is σ = 2469538368. Its totient is φ = 164339712.

The previous prime is 655231669. The next prime is 655231711. The reversal of 655231680 is 86132556.

It is a Harshad number since it is a multiple of its sum of digits (36).

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 39 ways as a sum of consecutive naturals, for example, 439897 + ... + 441383.

Almost surely, 2^655231680 is an apocalyptic number.

655231680 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 655231680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1234769184).

655231680 is an abundant number, since it is smaller than the sum of its proper divisors (1814306688).

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

655231680 is a wasteful number, since it uses less digits than its factorization.

655231680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1533 (or 1514 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 36.

The square root of 655231680 is about 25597.4936273066. The cubic root of 655231680 is about 868.5569418669.

The spelling of 655231680 in words is "six hundred fifty-five million, two hundred thirty-one thousand, six hundred eighty".