6420555 has 24 divisors (see below), whose sum is σ = 11316240. Its totient is φ = 3366720.

The previous prime is 6420523. The next prime is 6420587. The reversal of 6420555 is 5550246.

6420555 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (6420523) and next prime (6420587).

It is not a de Polignac number, because 6420555 - 2⁵ = 6420523 is a prime.

6420555 is a lucky number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1576 + ... + 3914.

It is an arithmetic number, because the mean of its divisors is an integer number (471510).

Almost surely, 2^6420555 is an apocalyptic number.

6420555 is a deficient number, since it is larger than the sum of its proper divisors (4895685).

6420555 is a wasteful number, since it uses less digits than its factorization.

6420555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2411 (or 2408 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 27.

The square root of 6420555 is about 2533.8814100111. The cubic root of 6420555 is about 185.8621073013.

The spelling of 6420555 in words is "six million, four hundred twenty thousand, five hundred fifty-five".