6405625044 has 192 divisors, whose sum is σ = 20787916800. Its totient is φ = 1660611456.

The previous prime is 6405625013. The next prime is 6405625063. The reversal of 6405625044 is 4405265046.

6405625044 is a `hidden beast` number, since 6 + 4 + 0 + 562 + 50 + 44 = 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 63 ways as a sum of consecutive naturals, for example, 574329 + ... + 585375.

It is an arithmetic number, because the mean of its divisors is an integer number (108270400).

Almost surely, 2^6405625044 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 6405625044, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10393958400).

6405625044 is an abundant number, since it is smaller than the sum of its proper divisors (14382291756).

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

6405625044 is a wasteful number, since it uses less digits than its factorization.

6405625044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11139 (or 11131 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 36.

The square root of 6405625044 is about 80035.1488035101. The cubic root of 6405625044 is about 1857.1793146103.

The spelling of 6405625044 in words is "six billion, four hundred five million, six hundred twenty-five thousand, forty-four".