6501620 has 12 divisors (see below), whose sum is σ = 13653444. Its totient is φ = 2600640.

The previous prime is 6501611. The next prime is 6501631. The reversal of 6501620 is 261056.

6501620 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 3254416 + 3247204 = 1804^2 + 1802^2 .

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 325081 = 6501620 / (6 + 5 + 0 + 1 + 6 + 2 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 6501592 and 6501601.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 162521 + ... + 162560.

It is an arithmetic number, because the mean of its divisors is an integer number (1137787).

Almost surely, 2^6501620 is an apocalyptic number.

It is an amenable number.

6501620 is an abundant number, since it is smaller than the sum of its proper divisors (7151824).

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

6501620 is a wasteful number, since it uses less digits than its factorization.

6501620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 325090 (or 325088 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 6501620 is about 2549.8274451421. The cubic root of 6501620 is about 186.6410608301.

Adding to 6501620 its reverse (261056), we get a palindrome (6762676).

The spelling of 6501620 in words is "six million, five hundred one thousand, six hundred twenty".