655394688 has 192 divisors, whose sum is σ = 2055034800. Its totient is φ = 199286784.

The previous prime is 655394687. The next prime is 655394699. The reversal of 655394688 is 886493556.

It is a happy number.

655394688 is a `hidden beast` number, since 6 + 553 + 9 + 4 + 6 + 88 = 666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (655394687) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1602228 + ... + 1602636.

Almost surely, 2^655394688 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 655394688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1027517400).

655394688 is an abundant number, since it is smaller than the sum of its proper divisors (1399640112).

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

655394688 is a wasteful number, since it uses less digits than its factorization.

655394688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 549 (or 534 counting only the distinct ones).

The product of its digits is 6220800, while the sum is 54.

The square root of 655394688 is about 25600.6774910353. The cubic root of 655394688 is about 868.6289621895.

The spelling of 655394688 in words is "six hundred fifty-five million, three hundred ninety-four thousand, six hundred eighty-eight".