6405562800 has 360 divisors, whose sum is σ = 27360269664. Its totient is φ = 1351434240.

The previous prime is 6405562789. The next prime is 6405562879. The reversal of 6405562800 is 82655046.

6405562800 is a `hidden beast` number, since 640 + 5 + 5 + 6 + 2 + 8 + 0 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (360).

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 (17) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 317824 + ... + 337376.

Almost surely, 2^6405562800 is an apocalyptic number.

6405562800 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 6405562800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13680134832).

6405562800 is an abundant number, since it is smaller than the sum of its proper divisors (20954706864).

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

6405562800 is a wasteful number, since it uses less digits than its factorization.

6405562800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19597 (or 19583 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 36.

The square root of 6405562800 is about 80034.7599484124. The cubic root of 6405562800 is about 1857.1732991347.

The spelling of 6405562800 in words is "six billion, four hundred five million, five hundred sixty-two thousand, eight hundred".