6420736 has 36 divisors (see below), whose sum is σ = 14651392. Its totient is φ = 2750976.

The previous prime is 6420731. The next prime is 6420737. The reversal of 6420736 is 6370246.

6420736 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

6420736 is a nontrivial binomial coefficient, being equal to C(3584, 2).

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is not an unprimeable number, because it can be changed into a prime (6420731) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1 + ... + 3583.

Almost surely, 2^6420736 is an apocalyptic number.

6420736 is the 3583-rd triangular number and also the 1792-nd hexagonal number.

6420736 is the 1195-th centered nonagonal number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6420736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7325696).

6420736 is an abundant number, since it is smaller than the sum of its proper divisors (8230656).

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

6420736 is an equidigital number, since it uses as much as digits as its factorization.

6420736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3606 (or 3592 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 28.

The square root of 6420736 is about 2533.9171257166. The cubic root of 6420736 is about 185.8638538131.

It can be divided in two parts, 64 and 20736, that multiplied together give a square (1327104 = 1152²).

The spelling of 6420736 in words is "six million, four hundred twenty thousand, seven hundred thirty-six".