6421700 has 18 divisors (see below), whose sum is σ = 13935306. Its totient is φ = 2568640.

The previous prime is 6421697. The next prime is 6421703. The reversal of 6421700 is 71246.

It is an interprime number because it is at equal distance from previous prime (6421697) and next prime (6421703).

It can be written as a sum of positive squares in 3 ways, for example, as 111556 + 6310144 = 334^2 + 2512^2 .

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

It is not an unprimeable number, because it can be changed into a prime (6421703) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 32009 + ... + 32208.

Almost surely, 2^6421700 is an apocalyptic number.

It is an amenable number.

6421700 is an abundant number, since it is smaller than the sum of its proper divisors (7513606).

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

6421700 is a wasteful number, since it uses less digits than its factorization.

6421700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64231 (or 64224 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 6421700 is about 2534.1073379003. The cubic root of 6421700 is about 185.8731551242.

Adding to 6421700 its reverse (71246), we get a palindrome (6492946).

The spelling of 6421700 in words is "six million, four hundred twenty-one thousand, seven hundred".