655209984 has 320 divisors, whose sum is σ = 2172360960. Its totient is φ = 172523520.

The previous prime is 655209977. The next prime is 655210001. The reversal of 655209984 is 489902556.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4173234 + ... + 4173390.

It is an arithmetic number, because the mean of its divisors is an integer number (6788628).

Almost surely, 2^655209984 is an apocalyptic number.

655209984 is a gapful number since it is divisible by the number (64) 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 655209984, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1086180480).

655209984 is an abundant number, since it is smaller than the sum of its proper divisors (1517150976).

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

655209984 is a wasteful number, since it uses less digits than its factorization.

655209984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221 (or 205 counting only the distinct ones).

The product of its (nonzero) digits is 777600, while the sum is 48.

The square root of 655209984 is about 25597.0698323070. The cubic root of 655209984 is about 868.5473552225.

The spelling of 655209984 in words is "six hundred fifty-five million, two hundred nine thousand, nine hundred eighty-four".