6420773 has 4 divisors (see below), whose sum is σ = 6477708. Its totient is φ = 6363840.

The previous prime is 6420769. The next prime is 6420787. The reversal of 6420773 is 3770246.

6420773 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 954529 + 5466244 = 977^2 + 2338^2 .

It is a cyclic number.

It is not a de Polignac number, because 6420773 - 2² = 6420769 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6420763) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28298 + ... + 28523.

It is an arithmetic number, because the mean of its divisors is an integer number (1619427).

Almost surely, 2^6420773 is an apocalyptic number.

It is an amenable number.

6420773 is a deficient number, since it is larger than the sum of its proper divisors (56935).

6420773 is a wasteful number, since it uses less digits than its factorization.

6420773 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56934.

The product of its (nonzero) digits is 7056, while the sum is 29.

The square root of 6420773 is about 2533.9244266552. The cubic root of 6420773 is about 185.8642108308.

The spelling of 6420773 in words is "six million, four hundred twenty thousand, seven hundred seventy-three".