6390720 has 168 divisors, whose sum is σ = 25200864. Its totient is φ = 1456128.

The previous prime is 6390719. The next prime is 6390721. The reversal of 6390720 is 270936.

6390720 is a `hidden beast` number, since 639 + 0 + 7 + 20 = 666.

It is an interprime number because it is at equal distance from previous prime (6390719) and next prime (6390721).

It is a tau number, because it is divible by the number of its divisors (168).

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6390721) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20002 + ... + 20318.

Almost surely, 2^6390720 is an apocalyptic number.

6390720 is a gapful number since it is divisible by the number (60) 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 6390720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12600432).

6390720 is an abundant number, since it is smaller than the sum of its proper divisors (18810144).

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

6390720 is a wasteful number, since it uses less digits than its factorization.

6390720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 347 (or 334 counting only the distinct ones).

The product of its (nonzero) digits is 2268, while the sum is 27.

The square root of 6390720 is about 2527.9873417405. The cubic root of 6390720 is about 185.5737725524.

The spelling of 6390720 in words is "six million, three hundred ninety thousand, seven hundred twenty".