6420770 has 8 divisors (see below), whose sum is σ = 11557404. Its totient is φ = 2568304.

The previous prime is 6420769. The next prime is 6420787. The reversal of 6420770 is 770246.

It can be written as a sum of positive squares in 2 ways, for example, as 6235009 + 185761 = 2497^2 + 431^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

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 3 ways as a sum of consecutive naturals, for example, 321029 + ... + 321048.

Almost surely, 2^6420770 is an apocalyptic number.

6420770 is a deficient number, since it is larger than the sum of its proper divisors (5136634).

6420770 is a wasteful number, since it uses less digits than its factorization.

6420770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 642084.

The product of its (nonzero) digits is 2352, while the sum is 26.

The square root of 6420770 is about 2533.9238346880. The cubic root of 6420770 is about 185.8641818835.

The spelling of 6420770 in words is "six million, four hundred twenty thousand, seven hundred seventy".