6406620 has 96 divisors (see below), whose sum is σ = 20756736. Its totient is φ = 1459200.

The previous prime is 6406601. The next prime is 6406639. The reversal of 6406620 is 266046.

It is an interprime number because it is at equal distance from previous prime (6406601) and next prime (6406639).

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 31 ways as a sum of consecutive naturals, for example, 10935 + ... + 11505.

It is an arithmetic number, because the mean of its divisors is an integer number (216216).

Almost surely, 2^6406620 is an apocalyptic number.

6406620 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 6406620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10378368).

6406620 is an abundant number, since it is smaller than the sum of its proper divisors (14350116).

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

6406620 is a wasteful number, since it uses less digits than its factorization.

6406620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 611 (or 609 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 6406620 is about 2531.1301823494. The cubic root of 6406620 is about 185.7275465313.

It can be divided in two parts, 640 and 6620, that added together give a triangular number (7260 = T₁₂₀).

The spelling of 6406620 in words is "six million, four hundred six thousand, six hundred twenty".