655565400 has 576 divisors, whose sum is σ = 2729825280. Its totient is φ = 143078400.

The previous prime is 655565377. The next prime is 655565429. The reversal of 655565400 is 4565556.

It is a happy number.

655565400 is a `hidden beast` number, since 6 + 55 + 565 + 40 + 0 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 13948177 + ... + 13948223.

It is an arithmetic number, because the mean of its divisors is an integer number (4739280).

Almost surely, 2^655565400 is an apocalyptic number.

655565400 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 655565400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1364912640).

655565400 is an abundant number, since it is smaller than the sum of its proper divisors (2074259880).

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

655565400 is a wasteful number, since it uses less digits than its factorization.

655565400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126 (or 105 counting only the distinct ones).

The product of its (nonzero) digits is 90000, while the sum is 36.

The square root of 655565400 is about 25604.0114044655. The cubic root of 655565400 is about 868.7043734987.

The spelling of 655565400 in words is "six hundred fifty-five million, five hundred sixty-five thousand, four hundred".