6663744 has 84 divisors (see below), whose sum is σ = 19970496. Its totient is φ = 2120448.

The previous prime is 6663739. The next prime is 6663749. The reversal of 6663744 is 4473666.

It is an interprime number because it is at equal distance from previous prime (6663739) and next prime (6663749).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 6663699 and 6663708.

It is not an unprimeable number, because it can be changed into a prime (6663749) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12997 + ... + 13499.

It is an arithmetic number, because the mean of its divisors is an integer number (237744).

Almost surely, 2^6663744 is an apocalyptic number.

6663744 is a gapful number since it is divisible by the number (64) 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 6663744, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9985248).

6663744 is an abundant number, since it is smaller than the sum of its proper divisors (13306752).

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

6663744 is a wasteful number, since it uses less digits than its factorization.

6663744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 544 (or 531 counting only the distinct ones).

The product of its digits is 72576, while the sum is 36.

The square root of 6663744 is about 2581.4228634612. The cubic root of 6663744 is about 188.1796984097.

The spelling of 6663744 in words is "six million, six hundred sixty-three thousand, seven hundred forty-four".