6402620 has 96 divisors (see below), whose sum is σ = 16934400. Its totient is φ = 1983744.

The previous prime is 6402619. The next prime is 6402629. The reversal of 6402620 is 262046.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 6402592 and 6402601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6402629) by changing a digit.

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, 77099 + ... + 77181.

It is an arithmetic number, because the mean of its divisors is an integer number (176400).

Almost surely, 2^6402620 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 6402620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8467200).

6402620 is an abundant number, since it is smaller than the sum of its proper divisors (10531780).

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

6402620 is a wasteful number, since it uses less digits than its factorization.

6402620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147 (or 145 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 6402620 is about 2530.3398981165. The cubic root of 6402620 is about 185.6888852271.

Adding to 6402620 its reverse (262046), we get a palindrome (6664666).

It can be divided in two parts, 64026 and 20, that added together give a palindrome (64046).

The spelling of 6402620 in words is "six million, four hundred two thousand, six hundred twenty".