655021080 has 224 divisors, whose sum is σ = 2526141600. Its totient is φ = 149672448.

The previous prime is 655021063. The next prime is 655021141. The reversal of 655021080 is 80120556.

655021080 is a `hidden beast` number, since 6 + 550 + 2 + 108 + 0 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 202516 + ... + 205724.

Almost surely, 2^655021080 is an apocalyptic number.

655021080 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 655021080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1263070800).

655021080 is an abundant number, since it is smaller than the sum of its proper divisors (1871120520).

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

655021080 is a wasteful number, since it uses less digits than its factorization.

655021080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3245 (or 3226 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 27.

The square root of 655021080 is about 25593.3796127045. The cubic root of 655021080 is about 868.4638767225.

The spelling of 655021080 in words is "six hundred fifty-five million, twenty-one thousand, eighty".