6420650 has 12 divisors (see below), whose sum is σ = 11942502. Its totient is φ = 2568240.

The previous prime is 6420599. The next prime is 6420683. The reversal of 6420650 is 560246.

It can be written as a sum of positive squares in 3 ways, for example, as 5230369 + 1190281 = 2287^2 + 1091^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 64157 + ... + 64256.

Almost surely, 2^6420650 is an apocalyptic number.

6420650 is a deficient number, since it is larger than the sum of its proper divisors (5521852).

6420650 is a wasteful number, since it uses less digits than its factorization.

6420650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128425 (or 128420 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 6420650 is about 2533.9001558862. The cubic root of 6420650 is about 185.8630239829.

Adding to 6420650 its reverse (560246), we get a palindrome (6980896).

The spelling of 6420650 in words is "six million, four hundred twenty thousand, six hundred fifty".