6420777 has 8 divisors (see below), whose sum is σ = 9339360. Its totient is φ = 3891360.

The previous prime is 6420769. The next prime is 6420787. The reversal of 6420777 is 7770246.

It is a happy number.

6420777 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 6420777 - 2³ = 6420769 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33), and also a Moran number because the ratio is a prime number: 194569 = 6420777 / (6 + 4 + 2 + 0 + 7 + 7 + 7).

6420777 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (6420707) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 97252 + ... + 97317.

It is an arithmetic number, because the mean of its divisors is an integer number (1167420).

Almost surely, 2^6420777 is an apocalyptic number.

It is an amenable number.

6420777 is a deficient number, since it is larger than the sum of its proper divisors (2918583).

6420777 is a wasteful number, since it uses less digits than its factorization.

6420777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194583.

The product of its (nonzero) digits is 16464, while the sum is 33.

The square root of 6420777 is about 2533.9252159446. The cubic root of 6420777 is about 185.8642494273.

The spelling of 6420777 in words is "six million, four hundred twenty thousand, seven hundred seventy-seven".