6420744 has 96 divisors (see below), whose sum is σ = 19412640. Its totient is φ = 1916640.

The previous prime is 6420737. The next prime is 6420763. The reversal of 6420744 is 4470246.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 95799 + ... + 95865.

It is an arithmetic number, because the mean of its divisors is an integer number (202215).

Almost surely, 2^6420744 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 6420744, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9706320).

6420744 is an abundant number, since it is smaller than the sum of its proper divisors (12991896).

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

6420744 is a wasteful number, since it uses less digits than its factorization.

6420744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112 (or 83 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 27.

The square root of 6420744 is about 2533.9187042997. The cubic root of 6420744 is about 185.8639310063.

The spelling of 6420744 in words is "six million, four hundred twenty thousand, seven hundred forty-four".