6403536 has 90 divisors (see below), whose sum is σ = 18914402. Its totient is φ = 2099520.

The previous prime is 6403511. The next prime is 6403571. The reversal of 6403536 is 6353046.

It can be written as a sum of positive squares in only one way, i.e., 3779136 + 2624400 = 1944^2 + 1620^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a zygodrome in base 3.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 104946 + ... + 105006.

Almost surely, 2^6403536 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 6403536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9457201).

6403536 is an abundant number, since it is smaller than the sum of its proper divisors (12510866).

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

6403536 is an frugal number, since it uses more digits than its factorization.

6403536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93 (or 66 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 27.

The square root of 6403536 is about 2530.5208949938. The cubic root of 6403536 is about 185.6977400870.

The spelling of 6403536 in words is "six million, four hundred three thousand, five hundred thirty-six".